nodejs/performance

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Node.js team focusing on performance

Stars: 399
Forks: 11
Open beginner issues: 0
Indexed issues: 59
Avg merge: 29m
Merged PRs (30d): 1

Dominant language: Shell
License: MIT
Last GitHub push: Sep 8, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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59 open issues indexed

Include performance benchmarks in release blog posts Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

nodejs/performance#195 · 1 comment · 1 reaction · Opened Jul 8, 2026
buffer: optimize Buffer.toString('hex') for small buffers with stack allocation Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#194 · 5 comments · 1 reaction · Opened Mar 5, 2026
Set UV_THREADPOOL_SIZE dinamically on startup Open

benchmark-needed

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nodejs/performance#193 · 1 comment · 3 reactions · Opened Jan 21, 2026
Optimize TextEncoder::encode Open

major performance regression

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#192 · 33 comments · 7 reactions · Opened Nov 3, 2025
Create a test for each benchmark file Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 42/100

nodejs/performance#187 · 11 comments · Opened Aug 15, 2025
Calibrate benchmark files Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nodejs/performance#186 · 1 reaction · Opened Aug 15, 2025
TextDecode Regression Open

benchmark-needed

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nodejs/performance#183 · 3 comments · Opened Dec 11, 2024
Revisit Fast APIs implementations & New implementations Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#182 · 3 comments · 2 reactions · Opened Nov 10, 2024
sqlite and local/sessionStorage Open

help wanted

Difficulty 5/5 Over a week Newbie friendliness 15/100

nodejs/performance#181 · 2 comments · Opened Oct 28, 2024
`Buffer.write(Array<string|Buffer>, offset: number, encoding: string)` Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

nodejs/performance#168 · 3 comments · Opened May 20, 2024
node22 performance degradation Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

nodejs/performance#184 · 17 comments · 2 reactions · Opened Apr 26, 2024
Avoid passing `process.env` if not exist on spawnSync and execSync Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#164 · 4 comments · 3 reactions · Opened Apr 19, 2024
Node.js Performance Team Meeting 2024-04-15 Open

nodejs/performance#160 · 1 assignee · Opened Apr 10, 2024
JIT startsWith and endsWith Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#159 · 11 comments · Opened Apr 9, 2024
manually inlining validator functions improves performance Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nodejs/performance#154 · 6 comments · Opened Mar 19, 2024
readFile in promises very slow Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

nodejs/performance#151 · 25 comments · 3 reactions · Opened Mar 11, 2024
Remove double buffer in http.IncomingMessage Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#148 · 1 reaction · Opened Feb 9, 2024
Bring in a faster Transform stream Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#147 · 6 comments · 2 reactions · Opened Feb 8, 2024
Optimizing fs.readFile by skipping fstat calls for small files Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#141 · 1 comment · Opened Dec 13, 2023
Optimizing internal argument validation functions Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#140 · 11 comments · 1 reaction · Opened Dec 2, 2023
Fast path for CommonJS on Module._compile Open

Difficulty 5/5 Over a week Newbie friendliness 28/100

nodejs/performance#139 · 6 comments · Opened Nov 28, 2023
Optimize child_process performance Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#138 · 4 comments · Opened Nov 25, 2023
OutgoingMessage.writeFile Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#135 · 2 comments · 3 reactions · Opened Nov 18, 2023
Performance optimizations for web ReadableStream/WritableStream Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#134 · 3 comments · 29 reactions · Opened Nov 12, 2023
some suggestion Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#131 · 1 reaction · Opened Nov 7, 2023
Safely ignore error stack trace Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#130 · 15 comments · Opened Oct 31, 2023
performance of encodings (hex, base64, base64url) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#128 · 7 comments · 1 reaction · Opened Oct 23, 2023
Node v16 vs v20/v21 regression on http perf Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

nodejs/performance#127 · 7 comments · 1 reaction · Opened Oct 19, 2023
V8 Fast Api documentation unclear Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

nodejs/performance#126 · 1 comment · Opened Oct 18, 2023
Blob.text and Blob.arraybuffer are 10x+ slower on 20.x Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#118 · 15 comments · Opened Sep 21, 2023
Stream performance improvement ideas Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#117 · 32 comments · 7 reactions · Opened Sep 21, 2023
undici websocket Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nodejs/performance#114 · 5 comments · 3 reactions · Opened Sep 18, 2023
Class over raw object Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#113 · 17 comments · Opened Sep 18, 2023
Move certain `fs/utils` to c++ Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nodejs/performance#111 · 8 comments · 3 reactions · Opened Sep 11, 2023
Bring back clonefile on Mac OS X Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nodejs/performance#110 · 3 comments · 15 reactions · Opened Sep 11, 2023
The http parser is not async, why does it hook into the async_hook machinery? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#108 · 7 comments · 4 reactions · Opened Sep 6, 2023
Performance of `node:fs` Open

nodejs/performance#106 · 19 comments · 52 reactions · 1 assignee · Opened Aug 18, 2023
Perfomance regression node 16.20.0 -> 18.16.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

nodejs/performance#95 · 19 comments · 1 reaction · Opened Jun 7, 2023
async versions of slow libuv calls? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#93 · 5 comments · Opened Jun 2, 2023
crypto.pbkdf2Sync - ~40% performance drop from node 14/16 to 18/20 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nodejs/performance#84 · 3 comments · Opened May 20, 2023
Performance of WHATWG ReadableStream.read() Open

good first issue help wanted

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#82 · 18 comments · Opened May 15, 2023
Revisit benchmarker for HTTP benchmarks Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#80 · 5 reactions · Opened May 12, 2023
Performance of primordials Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#70 · 11 comments · 2 reactions · Opened Apr 5, 2023
Increase max_semi_space Open

help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nodejs/performance#67 · 12 comments · Opened Mar 22, 2023
add/remove handlers are slow on EventTarget Open

help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nodejs/performance#60 · 11 comments · Opened Feb 20, 2023
stream.Transform should avoid writable state Open

benchmark-needed

Difficulty 5/5 Over a week Newbie friendliness 30/100

nodejs/performance#59 · 2 comments · 1 reaction · Opened Feb 15, 2023
Improve the performance of both URLSearchParams.toString and querystring.stringify Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 42/100

nodejs/performance#56 · 4 comments · Opened Feb 13, 2023
Bun & Deno Comparision Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

nodejs/performance#55 · 10 comments · 21 reactions · Opened Feb 10, 2023
Buffer.byteLength Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

nodejs/performance#52 · 26 comments · 3 reactions · Opened Feb 4, 2023
Explore fast path: `fs.isFile` and `fs.isDirectory` Open

good first issue

Difficulty 5/5 Over a week Newbie friendliness 25/100

nodejs/performance#46 · 2 comments · Opened Jan 23, 2023

nodejs/performance

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