Work for Performance

Introduction

This is a list of issues concerning performance in open-source software.
The list is compiled using the APIs of libraries.io and github.com.
The most depended-upon packages are pulled and the oldest 5 open issues with "performance" in their tag or title are downloaded.

Motivation

Author

Made by Fabian Zeindl
https://www.fabianzeindl.com
https://github.com/fab1an
LinkedIn

Open issues per language

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Java

• junit-team/junit4 - Performance issue: @DataPoints from functions and @Theory with multiple arguments
• google/guava - Faster simplifyPath
• google/guava - FileBackedOutputStream: possibility to delete the file without File.deleteOnExit()
• google/guava - Guava ImmutableList (and others) offer awful performance in some cases due to size-optmized specializations
• google/guava - Possible optimization of FluentIterable.transform
• google/guava - We should one day implement the TODO for an efficient ImmutableMultiset.asList()
• mockito/mockito - Performance issue with JUnit5 Jupiter (MockitoExtension)
• mockito/mockito - Improve performance of MockitoJUnitRunner
• mockito/mockito - Performance degradation after migration to mockito 2
• mockito/mockito - Mockito initialise performance
• FasterXML/jackson-databind - Huge performance problem deserializing java.nio.file.Path with existing Windows Samba/CIFS mounts
• FasterXML/jackson-databind - Optimize `JsonNodeDeserialization` wrt recursion
• FasterXML/jackson-databind - Need Ideas for improving Startup performance
• FasterXML/jackson-databind - Poor performance when upgrading from 2.12.2 to 2.13.3
• FasterXML/jackson-databind - Make `BeanDeserializer` consider `DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES` to avoid buffering
• FasterXML/jackson-core - Add `vanilla` flag for generators
• FasterXML/jackson-core - Add configurable "document/processing limits" for JSON parser
• FasterXML/jackson-core - look at uptaking some of the performance and fast-fail BigDecimal parser code from jsoniter-scala
• projectlombok/lombok - 1.14.0 slowing down Eclipse (SpringTool Suite Edition)
• projectlombok/lombok - Performance decrease when using lombok 1.14 with STS 3.6.0
• projectlombok/lombok - Performance issues with a large amount of @Singular annotations within one class
• projectlombok/lombok - Extensive performance issues with Lombok and STS/Eclipse
• projectlombok/lombok - [BUG] Very slow compilation on Eclipse 2019.03 with Lombok 1.18.10
• assertj/assertj-core - Slow compile time (probably related to JDK-8152289)
• assertj/assertj-core - Improve the performance of methods SoftAssertions#assertThat
• assertj/assertj-core - Slow performance for `Path` and `File` assertions tests
• cbeust/testng - SuiteHTMLReporter is too slow.
• spring-projects/spring-framework - Optimize performance of autowiring for Groovy/Grails [SPR-11864]
• spring-projects/spring-framework - Autowiring with @Autowired/@Inject get much slower than with @Resource as the number of classes increases [SPR-13086]
• spring-projects/spring-framework - Improve performance of #getBeanNamesForType() while the BeanFactory configuration is not yet frozen [SPR-13610]
• spring-projects/spring-framework - JDK aop invoke very slow [SPR-15832]
• spring-projects/spring-framework - Improve HandlerMappingIntrospector performance [SPR-16013]
• hamcrest/JavaHamcrest - hasKey performance issue

JavaScript

• mochajs/mocha - feature: make "slow" (by default) a function of "timeout"
• webpack/webpack - Allow for multiple Performance Budgets
• webpack/webpack - [webpack 5] rebuild is twice as slow comparing to webpack 4
• webpack/webpack - Treeshaking with side effect free package is unexpectedly slow
• webpack/webpack - Hoist RegExp Literals in SourceMapDevToolPlugin
• webpack/webpack - Massive performance regression on 5.71.0 during initial script execution.
• facebook/react - Performance enhancements in niche situations
• facebook/react - Root-level performance events
• facebook/react - DevTools: Better linking between browser Performance tab and DevTools Profiler
• facebook/react - Distribute source maps for easier debugging in Chrome's Performance tab
• facebook/react - Question: React supports performance answers。
• prettier/prettier - Slow start time
• prettier/prettier - Performance on big files
• prettier/prettier - formatWithCursor performance bottleneck
• prettier/prettier - big ignore paths slow down cli
• prettier/prettier - cache still much slower than `dprint` incremental w/prettier plugin
• import-js/eslint-plugin-import - Eslint is slow when used with webpack
• import-js/eslint-plugin-import - no-restricted-paths is slow when many imports/excepts
• import-js/eslint-plugin-import - import/no-extraneous-dependencies and import/order pretty slow
• import-js/eslint-plugin-import - `import/namespace` is very slow
• import-js/eslint-plugin-import - Huge `import/no-cycle` performance downgrade in 2.25.3
• lodash/lodash - set equality is slow
• lodash/lodash - _.isEqual is terribly slow when comparing two sets
• lodash/lodash - The cloneDeep method of lodash has serious performance bug
• isaacs/rimraf - Why is rimraf slower than `rm -rf`?
• rollup/rollup - Document how to investigate rollup performance issues in order to locate+report a bug
• jsx-eslint/eslint-plugin-react - react/style-prop-object: document performance issues
• webpack/webpack-dev-server - Application with multiple iframes performances problems on hot reload
• webpack/webpack-dev-server - Poor performance with big project

TypeScript

• Microsoft/TypeScript - Performance of getSemanticDiagnostics in compiler API
• Microsoft/TypeScript - Missing onresourcetimingbufferfull event from Performance interface
• Microsoft/TypeScript - TypeScript Language Service is slow to load projects over network file systems
• Microsoft/TypeScript - Skip type checking project reference redirect(declaration file from project reference) to improve perf
• Microsoft/TypeScript - TS Server performance 10-50mb files
• facebook/jest - Jest performance is at best 2x slower than Jasmine, in our case 7x slower
• facebook/jest - Jest is 3x slower on all windows machines (Windows 10 and lower)
• facebook/jest - Very poor performance on basic tests
• facebook/jest - Performance issue: with two cores 1 worker is faster than 2 workers
• facebook/jest - jest.mock slows down tests a lot
• babel/babel - creating `OptionManager` instances is super slow in @babel/register
• babel/babel - @babel/plugin-transform-react-inline-elements performance boost
• babel/babel - Slow startup time due to iterating all files in ignored directory
• babel/babel - [Bug]: using babel.config.js with cache.forever() still has significant performance impact due to expensive cache invalidation check
• babel/babel - Investigate performance of `@babel/register/experimental-worker`
• TypeStrong/ts-node - Update all bundled node sources to latest node v18 versions; use `process.binding('fs')` for performance
• Microsoft/tslib - __spread Performance Issues
• typescript-eslint/typescript-eslint - OOM when many (>10) project configs passed to the parser
• typescript-eslint/typescript-eslint - Purge programs once they are done
• typescript-eslint/typescript-eslint - Support for Project References
• typescript-eslint/typescript-eslint - Documentation feature request - Rule performance benchmarks
• typescript-eslint/typescript-eslint - Cleanup old file/folder watch callbacks
• kulshekhar/ts-jest - RFC: Performance report for each ts-jest version
• kulshekhar/ts-jest - Module caching memory leak
• kulshekhar/ts-jest - High memory usage with jest projects
• kulshekhar/ts-jest - Massive performance degradation in getCacheKey()
• vuejs/core - Improve reactive collections performance
• vuejs/vue - VueSSRServerPlugin produces a slow-to-parse JSON for large projects
• vuejs/vue - An anti-pattern in computed property may cause performance issue
• vuejs/vue - Performance: Include/Use uid in the name when using performance.measure
• vuejs/vue - Performance: compile default slots to functions
• vuejs/vue - Computed properties can have widely different performance characteristics on client and server (because they are not cached during SSR)
• reactivex/rxjs - Very slow comparative performance

PHP

• sebastianbergmann/phpunit - PHPUnit should not create a diff when expected or actual string are too large
• sebastianbergmann/phpunit - PHPUnit9 @runInSeparateProcess is very slow in group execution
• sebastianbergmann/phpunit - TestCase is instanciated per test (correct), but not destroyed immediatelly (wrong, non GCable)
• squizlabs/PHP_CodeSniffer - phpcbf slow execution with unfixable comment
• squizlabs/PHP_CodeSniffer - Codesniffer slow when Xdebug is enabled
• squizlabs/PHP_CodeSniffer - Caching on Windows makes CS check incredibly slow
• FriendsOfPHP/PHP-CS-Fixer - "binary_operator_spaces" and "whitespace_after_comma_in_array" rules are extremely slow
• FriendsOfPHP/PHP-CS-Fixer - Show slow tests
• FriendsOfPHP/PHP-CS-Fixer - Slow tests execution
• doctrine/orm - DDC-1602: Executors for Class Table Inheritance (JOINED) are extremely slow on MySQL
• doctrine/orm - DDC-3282: Pagination class CountOutputWalker has poor performance with MySQL
• doctrine/orm - X-ToMany Associations with mixed type JoinColumns and resultant Query performance fetching Collection
• doctrine/orm - Low performance when executing setParameter() on a query that has a big amount of parameters
• symfony/symfony - ESI fragment disable the profiler performance tab (stopwatch)
• symfony/symfony - [Messenger] Bad performances with the Doctrine/MySQL transport
• Codeception/Codeception - Feature Request: --fail-slow=10
• vimeo/psalm - Performance problems with uncached stub files. Is this expected?

Go

• Stretchr/testify - call to testing.T.Helper() slows down execution
• golang/protobuf - protoc-gen-go: fully generate marshaling and unmarshaling code
• golang/protobuf - proto: add scatter/gather API for serialization
• golang/protobuf - proto: specialize map for performance
• golang/protobuf - protoc-gen-go: elide sizeCache for small messages
• golang/protobuf - protoc-gen-go: use pointer for unknownFields
• grpc/grpc-go - transport: reuse memory on read path
• grpc/grpc-go - Create benchmarks for header metadata
• grpc/grpc-go - Under 80% network utilization for LAN networks with large messages and high concurrency
• grpc/grpc-go - New CallOption: grpc.ManualCancel
• grpc/grpc-go - server: Stats handler and InTapHandle called during critical read path
• prometheus/client_Golang - Improve counter performance with per-CPU sharded values once they are available in Go
• gogo/protobuf - Significant performance variation for defining times
• gogo/protobuf - `(gogoproto.stdtime) = true` causes low marshal performance
• gogo/protobuf - gogo jsonpb is 10x slower than golang json Unmarshal?
• json-iterator/go - 😢 Go 1.14 json beats json-iterator in performance
• json-iterator/go - Marshaling slice of structs with one NaN value in the first struct fails slowly vs. encoding/json, also has huge error message
• onsi/ginkgo - [FAIL] Flags Specs [It] should run the race detector when told to [slow]

Rust

• serde-rs/serde - Investigate compile time of serde crate
• serde-rs/json - SIMD vectorization behind a feature flag
• serde-rs/json - Parsing 20MB file using from_reader is slow
• serde-rs/json - Serialize/Deserialize implementations are very slow to compile
• serde-rs/json - In situ parsing
• serde-rs/json - Allow deserializing strings as sequences to not allocate on strings with escape sequences
• tokio-rs/tokio - File operations don't use the whole buffer
• tokio-rs/tokio - Multithreaded runtime causes lot of single byte write syscalls
• tokio-rs/tokio - Heavy contention on blocking
• tokio-rs/tokio - Document performance considerations tokio::fs
• tokio-rs/tokio - rt: high tail latencies with threaded scheduler when under load
• rust-random/rand - Rng::gen_range() is slowest with power-of-2 input sizes?
• rust-lang/futures-rs - Question: `read_to_end` suffers poor performance when reading huge object
• chronotope/chrono - Getting time and formatting it seems slow.
• chronotope/chrono - Performance of retrieving the month, day, etc. from a DateTime
• chronotope/chrono - Local is horribly slow when used in multi-threads
• seanmonstar/reqwest - Why does the performance of reqwest fluctuate so much?
• seanmonstar/reqwest - Reqwest with rustls backend is slow
• env-logger-rs/env_logger - Slowness
• tokio-rs/bytes - `io::Write` via `buf::Writer` on `BytesMut` significantly slower than on `Vec`
• rust-itertools/itertools - performance of all_equal
• rust-itertools/itertools - travis pipeline is slow
• rust-itertools/itertools - itertools::Join is 2X slower than alternative.

Ruby

• rubygems/rubygems - Could boot performance be improved? Caching default gems perhaps?
• rubygems/rubygems - Investigate performance regressions on Windows CI
• rubygems/rubygems - Very slow dependency resolving
• pry/pry - find-method performance
• pry/pry - Strange, strange performance impact on Windows
• rails/rails - ActionView Erubis rendering is ten times slower than plain Erubis
• rails/rails - ActionCable streaming performance
• rails/rails - Slow performance when rendering collections of nested partials
• rubocop/rubocop - Quick performance review
• rubocop/rubocop - PathUtil.smart_path causes performance issue on case large amount of offenses
• rubocop/rubocop - Inconsistency between Style/ExplicitBlockArgument and Performance/RedundantBlockCall
• rubocop/rubocop - Performance issues with custom configuration
• sparklemotion/sqlite3-ruby - superfluous work in #ordered_map_for
• ruby/rdoc - ri documentation stalls during installing with ruby
• puppetlabs/puppetlabs-stdlib - slow custom facts
• deivid-rodriguez/byebug - Byebug 11 performance decreases when breakpoint set

C

• sparklemotion/nokogiri - #xpath performance
• sparklemotion/nokogiri - too large memory footprint in READER node.attributes when millions of child nodes are present
• sparklemotion/nokogiri - investigate #1970 - string optimization
• sparklemotion/nokogiri - Explore why the builtin XPath function for CSS class selector is so slow on JRuby
• sparklemotion/nokogiri - explore: optimize `Node#at_css` and `#at_xpath`
• mattn/go-sqlite3 - Next and Scan appear to be relatively slow?
• Legrandin/pycryptodome - Performance vs hashlib (SHA-512)
• Legrandin/pycryptodome - SHA512 from Cryptodome.Hash slower than sha512 from hashlib
• Legrandin/pycryptodome - Crypto.Util.number.size is a bit slow
• Legrandin/pycryptodome - Slow Public Key Generation
• mrabarnett/mrab-regex - Missing performance comparison with re
• brianmario/yajl-ruby - Performance section of README needs update?
• ultrajson/ultrajson - Performance when deserializing a deeply nested object
• pygame/pygame - Profile Guided Optimization (PGO)
• pygame/pygame - Slow blitting with combined pixel and surface alpha
• pygame/pygame - CPU specific modules (neon, SSE4, etc).
• pygame/pygame - Enable SSE 4.2 builds (image.tostring)
• pygame/pygame - Performance degradation with Pygame 2.0.0 and 2.1.0 on Raspberry Pi
• rmagick/rmagick - RMagick never releases the Global VM Lock
• r-lib/xml2 - xml_ns() creates surprising performance bottleneck
• r-lib/xml2 - print.xml_nodeset very slow for document with one huge node
• pysam-developers/pysam - Significant slow downs reading small CRAM files
• pysam-developers/pysam - performance problem :using find method of pysam.IndexedReads to get AlignedSegment object

C++

• sass/node-sass - Performance when using javascript custom functions
• sass/node-sass - Watcher is quite slow to recognize changes after recent watcher updates.
• sass/node-sass - Performance issues when upgrading node-sass version
• electron/electron - Very slow startup time on Windows 7 64 bit for electron version 2.0.0
• electron/electron - Async dialog API is slow to return on Linux
• electron/electron - Heavy CPU usage with tray.setImage
• electron/electron - [Feature Request]: Add additional APIs/info to Electron's process object for getting performance metrics
• electron/electron - [Bug]: DevTools performance profile lead to crash (or Renderer crash) on Apple M1 MacOS BigSur 11.3.1
• protocolbuffers/protobuf - Opensource C++ zero-copy API
• protocolbuffers/protobuf - There is no Java API for adding arrays of primitives to repeated fields without boxing
• protocolbuffers/protobuf - Buffer size used in writeDelimitedTo method is often too small
• protocolbuffers/protobuf - GetBlockSlow being called when using the same arena in multi-thread
• protocolbuffers/protobuf - C# Serialization Performance - Part II
• apache/arrow - read_parquet super slow
• apache/arrow - Arrow Flight C++/Java performance comparison
• google/flatbuffers - C++ Try to optimize Create<Table> builders
• grpc/grpc - Low performance of C++ multi-channel streaming and unary scenarios on nightly benchmarks
• grpc/grpc - Slow Installation of Firebase admin on Raspberry Pi Zero
• grpc/grpc - [Aio] Client performance regression
• grpc/grpc - Communication from c++ server to python client is too slow
• grpc/grpc - pecl install is slow and produces massive (55Mb) binary
• dmlc/xgboost - Call for contribution: improve multi-core CPU performance of 'hist'
• dmlc/xgboost - [jvm-packages] Checkpointing performance issue in XGBoost4J-Spark
• dmlc/xgboost - [jvm-packages] Performance differ XGBoost4j prediction in windows and linux?
• dmlc/xgboost - [jvm-packages] XGBoost Spark training quite slow - Good practices
• dmlc/xgboost - Colsample performance when using tree_method=hist
• react-native-community/react-native-linear-gradient - Slow performance on IOS inside list
• rethinkdb/rethinkdb - Have a cluster issue for when disk performance degrades
• rethinkdb/rethinkdb - We should consider gzipping `datum_t` objects when we serialize them
• rethinkdb/rethinkdb - Why is .sample() slow?
• rethinkdb/rethinkdb - Improve unordered table scans on rotational drives
• rethinkdb/rethinkdb - Test import/export/dump/restore speed, take 2
• microsoft/LightGBM - Slow dataset creation
• microsoft/LightGBM - Performance Gap between Non-Distributed and Distributed Lightgbm when Data is Sorted on Label
• microsoft/LightGBM - Very slow data loading for sparse dataset with a large number of features
• microsoft/LightGBM - Improve memory performance of Dataset loading by supporting a more streaming-based approach to loading Datasets.
• microsoft/LightGBM - Poor performance of LightGBM higher versions

Python

• psf/requests - Performance: Response.content is unnecessarily slow
• psf/requests - apparent_encoding should be cached since chardet can be slow
• numpy/numpy - choose() much slower than in numarray (Trac #938)
• numpy/numpy - Poor ndarray.take performance on Fortran order arrays (Trac #2065)
• numpy/numpy - abs() is slow for complex, add abs2()
• numpy/numpy - array_scalar * numpy_scalar is slow.
• numpy/numpy - numpy.linalg.cholesky performance
• pandas-dev/pandas - "Memoize" computations with hash table in pandas.core.strings
• pandas-dev/pandas - DOC: Timings/space of datatypes in the docs
• pandas-dev/pandas - string getitem methods are slow
• pandas-dev/pandas - PERF: pd.eval when using mixed types
• pandas-dev/pandas - col.replace(dict) takes too much memory
• pytest-dev/pytest - Very large test suites take *far* too much RAM
• pytest-dev/pytest - recursive symlink significantly slows collection
• pytest-dev/pytest - High memory usage if tests called by test case name
• pytest-dev/pytest - rough performance analysis of the current internals
• pytest-dev/pytest - Reduce memory usage of junitxml
• matplotlib/matplotlib - Speeding up the PDF backend
• matplotlib/matplotlib - Add benchmarking suite
• matplotlib/matplotlib - LaTeX rendering is really slow
• matplotlib/matplotlib - Refactor of `axis.py`/ticking should have large performance gains
• matplotlib/matplotlib - plt.pause() with threading is extremely slow for MacOSX backend
• scipy/scipy - Update/expand the PerformanceTips wiki page
• scipy/scipy - Monitoring performance regressions
• scipy/scipy - signal _correlateND is too slow for certain sizes
• scipy/scipy - Performance issue: scipy.linalg.solve_toeplitz is slow for T,x,b being matrices
• scipy/scipy - generic_filter slow on large images
• tqdm/tqdm - performance
• tqdm/tqdm - TQDM prints on previous line and scrolls up slowly
• pypa/setuptools - Install command is extremely slow on local machine
• pypa/setuptools - [BUG] Importing `setuptools` is slow and takes nearly half a second
• pypa/setuptools - [BUG] SETUPTOOLS_USE_DISTUTILS=local makes any `distutils` import very slow
• dateutil/dateutil - rrule.between is quite slow
• python-pillow/Pillow - Saving PNG images with PIL is 4 times slower than saving them with OpenCV
• python-pillow/Pillow - Performance of ImageDraw::text() and potential use of FTC_Manager()

C#

• DapperLib/Dapper - Bad performance when reading CLOBs on Oracle
• DapperLib/Dapper - Multiple Result reading is very slow.
• DapperLib/Dapper - Load-test of Async: Slow or Errors
• DapperLib/Dapper - slowness in select
• DapperLib/Dapper - dapper batch update or insert is particularly slow
• AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet - [Performance] Low hanging fruit in Tokens.JWT
• StackExchange/StackExchange.Redis - Common performance counters for client operations
• StackExchange/StackExchange.Redis - Performance issue with 2.x
• StackExchange/StackExchange.Redis - ConnectionMultiplexer takes up to 2 seconds to connect when run from within AWS lambda
• StackExchange/StackExchange.Redis - Passing a pooled array to HashSet/StreamAdd and similar methods.
• StackExchange/StackExchange.Redis - Timeout issues if running in docker container
• App-vNext/Polly - Execution-despatch optimization (reducing heap allocations)
• App-vNext/Polly - Logical Timeout/Slow Response Policy?
• domaindrivendev/Swashbuckle.AspNetCore - IncludeXmlComments performance issues
• Azure/azure-storage-net - XmlException causing performance hit when checking the existance of a non-existant directory
• npgsql/npgsql - Support reading/writing Span to/from bytea
• npgsql/npgsql - Investigate one-pass parameter writing
• npgsql/npgsql - Switch to Span/Memory internally
• npgsql/npgsql - Investigate using System.IO.Pipelines
• npgsql/npgsql - Use ThrowHelper instead of inline exception throwing
• dotnet/roslyn - Possible test perf improvement using null stream for pdb sink
• dotnet/roslyn - add a performance test for syntax tree diffing
• dotnet/roslyn - Fix opcodes from vb compiler when initialize an array and function local variant, jump invoke and delegate invoke.
• dotnet/roslyn - Survey memory usage of compiler symbols: how can it be reduced?
• dotnet/roslyn - Investigate one-level trees for improved batch compilation performance
• protobuf-net/protobuf-net - Investigate Bond performance
• protobuf-net/protobuf-net - Poor NetObjectCache performance with PCL
• protobuf-net/protobuf-net - Deserialization gets slow after deserializing large collection
• protobuf-net/protobuf-net - Serialization performance issue on high-core machines
• protobuf-net/protobuf-net - Protobuf-net Performance

Kotlin

• FasterXML/jackson-module-kotlin - Create performance tests for Kotlin module
• FasterXML/jackson-module-kotlin - Are there any microbenchmarks to check the performance impact against enabled the `StrictNullChecks` feature?
• Kotlin/kotlinx.coroutines - Scheduler: fast-path rendezvous between tryUnpark and re-scanning thread for CPU work
• Kotlin/kotlinx.coroutines - DataBinding with state flow performance issue
• Kotlin/kotlinx.coroutines - CoroutineScheduler: do not re-add stolen task to the head of the WorkerQueue where the task can be stolen from again
• Kotlin/kotlinx-io - Slow kotlinx.io.core.toByteArray
• square/picasso - Already downloaded images disappear while scrolling upwards in listview, loads slowly
• square/picasso - Problem in loading images in android ViewPager from http urls with slow connection.
• Kotlin/dukat - Converting a lot of *.d.ts files
• Kotlin/kotlinx.serialization - Pain point: JSON deserialization speed is slow in browser
• Kotlin/kotlinx.serialization - Deserialization of enums without @Serializable annotation is extremely slow in Kotlin JS

Top 10 repositories by stars

• donnemartin/system-design-primer - Is there a trade-off between performance and scalability?
• donnemartin/system-design-primer - Not clear how performance & scalability is a trade-off
• vuejs/vue - VueSSRServerPlugin produces a slow-to-parse JSON for large projects
• vuejs/vue - An anti-pattern in computed property may cause performance issue
• vuejs/vue - Performance: Include/Use uid in the name when using performance.measure
• vuejs/vue - Performance: compile default slots to functions
• vuejs/vue - Computed properties can have widely different performance characteristics on client and server (because they are not cached during SSR)
• facebook/react - Performance enhancements in niche situations
• facebook/react - Root-level performance events
• facebook/react - DevTools: Better linking between browser Performance tab and DevTools Profiler
• facebook/react - Distribute source maps for easier debugging in Chrome's Performance tab
• facebook/react - Question: React supports performance answers。
• tensorflow/tensorflow - tf.signal CPU FFT implementation is slower than NumPy, PyTorch, etc.
• tensorflow/tensorflow - non_max_suppression is very slow and doesn't appear to have a cuda or multi-threaded implementation
• tensorflow/tensorflow - Support MPSCNN (MetalPerformanceShaders) on iOS
• tensorflow/tensorflow - Momentum SGD is very slow with large embedding layer
• tensorflow/tensorflow - Loading model from local in RNN prediction is slower than from HDFS due to page fault
• getify/You-Dont-Know-JS - "async & performance": Document unhandled rejection hooks
• getify/You-Dont-Know-JS - "async & performance": keep an eye on SharedArrayBuffer proposals
• getify/You-Dont-Know-JS - "async & performance": slim down general explanations of iterators/generators
• getify/You-Dont-Know-JS - "async & performance": revise "TCO" discussion
• getify/You-Dont-Know-JS - "async & performance": ch6, update TCO section to mention strict mode
• twbs/bootstrap - Expounding on "opt-in for performance reasons"
• twbs/bootstrap - Collapse animation is jittery in Firefox Android (preview and live)
• twbs/bootstrap - Passive event listeners
• twbs/bootstrap - Use of "adjacent sibling" with "universal selector" triggers performance issue in Chrome
• ohmyzsh/ohmyzsh - Agnoster theme prompt extremly slow in mercurial
• ohmyzsh/ohmyzsh - git: parse_git_dirty is too slow
• ohmyzsh/ohmyzsh - git_prompt_status is slow on cygwin
• ohmyzsh/ohmyzsh - Loading kubectl plugin is slow
• ohmyzsh/ohmyzsh - detect-clipboard is slow on startup
• flutter/flutter - Consider using xz to compress production assets
• flutter/flutter - ui.window.locale should be set on startup
• flutter/flutter - Check performance of animated semantics changes on low-end devices
• flutter/flutter - Engine should eagerly call onBeginFrame after running Dart's main()
• flutter/flutter - Stack and other multi-child layout renderers should not call markNeedsPaint if they don't actually change their layout
• microsoft/vscode - `TabsTitleControl.layout()` slows down editor resize
• microsoft/vscode - [json] schema Validation/Intellisense very slow when JSON deep and Schema Complex
• microsoft/vscode - Slow when editing a file with very long lines
• microsoft/vscode - TreeItem is too slow
• microsoft/vscode - Slow syntax highlighting
• airbnb/javascript - README.md Performance section most of the urls return 503 error