Curated issues

Performance Good First Issues

Browse open source issues grouped under Performance. Where the subject goes by older names in the issue metadata, those are matched too.

Performance

What this list is like

Average annotated difficulty: 4.2/5 across 119,896 issues.
2% of 119,896 time estimates are one day or less.

Beginner friendly Everything

Open All

on_event clones every rule's trigger per bus event Open

area: cli area: dogs perf priority: P3

Difficulty 1/5 Under an hour Newbie friendliness 95/100

shep-pm/shep#558 · Opened Sep 21, 2026
Bark ring eviction is O(k*n) on every append Open

area: core perf priority: P2

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

shep-pm/shep#556 · Opened Sep 21, 2026
LVGL 9.5.0 leaks a draw layer per frame for objects at scale 0, exhausting memory; fixed in LVGL 9.6.0 Open

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

esphome/esphome#19439 · Opened Sep 21, 2026
reduce_grouped's backed path rescans the group codes for every group Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

scverse/mantispy#113 · Opened Sep 21, 2026
[Bug]: --kv-cache-memory suggestion double-counts CUDAGraph memory (regression of #37426, reintroduced by #49208) Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

vllm-project/vllm#57936 · 1 comment · Opened Sep 21, 2026
expo-image (Android): allowDownscaling={false} skips SafeDownsampleStrategy — fatal "Canvas: trying to draw too large bitmap" for images over the hardware canvas limit Open

contributor: external needs review

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

expo/expo#50429 · Opened Sep 21, 2026
performance: _detect_detectors scans entire repo for YAML files Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

yunaremaia/driftcheck#301 · Opened Sep 21, 2026
bug: Prevent layout shift from font loading on hero title Open

Difficulty 2/5 1-3 hours Newbie friendliness 66/100

SaboStudios/Blockopoly_Frontend#85 · Opened Sep 21, 2026
SCAN-family specs: exported throughput is requests/sec only, which is not comparable across implementations (COUNT is a hint) Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

redis/redis-benchmarks-specification#575 · Opened Sep 21, 2026
[pdata/xpdata/xhash]: MapHash takes quadratic time in the number of map entries Open

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

open-telemetry/opentelemetry-collector#15990 · Opened Sep 21, 2026
[react-doctor] js-length-check-first · src/screens/MapScreen/BoundsEditor.tsx:59 Open

react-doctor severity:warning tech-debt

Difficulty 1/5 Under an hour Newbie friendliness 88/100

digidem/comapeo-cloud-app#403 · Opened Sep 21, 2026
[Bug]: Dashed line flow animation in branch management panel causes GPU usage to spike (up to 99% on built-in XDR 120Hz screen) and continuous heating Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

CherryHQ/cherry-studio#20874 · 1 comment · 1 reaction · Opened Sep 21, 2026
[Perf]: the capability epoch counts archived skills, so archiving one rebuilds every Bot Chat's system prompt Open

area/sessions comp/agent P2 tool/skills type/perf

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

NousResearch/hermes-agent#117788 · Opened Sep 21, 2026
[perf-scan] 2026-09-21 -- performance opportunities found Open

type/automation type/performance

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

microsoft/apm#3046 · Opened Sep 21, 2026
fix(room): remove idle CPU drain from cosmos stars animation Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

i365dev/free4chat#449 · Opened Sep 21, 2026
[BUG]: Split-K matmul reduces partial sums in the output dtype by default; bf16 outputs that cancel are off by up to 40% on Ampere Open

bug_feature_triaged

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

modular/modular#7165 · Opened Sep 20, 2026
[Jak II] Apple Silicon: Haven City loads with no traffic/NPCs — 32 KB traffic pool allocation fails silently because the CWI level heap is too small Open

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

open-goal/jak-project#4424 · Opened Sep 20, 2026
Reduce memory usage of StaticMemPool Open

Difficulty 1/5 Under an hour Newbie friendliness 88/100

beyond-all-reason/RecoilEngine#3390 · 1 comment · Opened Sep 20, 2026
--workers N loses TCP_NODELAY: every keep-alive request past the first costs ~43ms on Linux Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

Kludex/uvicorn#3149 · Opened Sep 20, 2026
Multi-plate profiles are read one file at a time Open

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

scverse/mantispy#93 · Opened Sep 20, 2026
measure_execution_time() fails with num_runs=0 instead of validating the argument Open

Difficulty 1/5 1-3 hours Newbie friendliness 88/100

LearningCircuit/local-deep-research#6664 · 1 comment · Opened Sep 20, 2026
Incorrect output stride in Assignment 2 weighted sum example for higher-dimensional inputs Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

stanford-cs336/assignment2-systems#19 · Opened Sep 20, 2026
[VL] madvise(WILLNEED) call fails in MmapFileStream because of wrong calculation of fetching length Open

bug triage

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

apache/gluten#13062 · Opened Sep 20, 2026
[Performance]: [NPU] Remove redundant stream synchronization in record_device_event() (~15 ms per-request bubble in async diffusion output) Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

vllm-project/vllm-omni#7894 · 1 comment · Opened Sep 20, 2026
KdaState._zeros holds a full duplicate carry per KDA layer Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

tenstorrent/tt-metal#57110 · Opened Sep 20, 2026
bug: KnownPackagesDB.is_known() recomputes lowered package set on every call — O(n) lookup in hot path Open

performance

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

yunaremaia/taintrace#102 · Opened Sep 20, 2026
[BUG] fused mHC cuTile backward fails for micro-batches with M < 128 tokens that are not a power of two (tile_m_scalar = min(128, M)) Open

bug community-request module: moe

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

NVIDIA/Megatron-LM#7524 · 1 comment · 1 assignee · Opened Sep 20, 2026
filter_gateway_title() runs a wasted wc_get_order() lookup on every page (not just orders) Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

woocommerce/woocommerce-gateway-stripe#5975 · Opened Sep 19, 2026
Add PageRank benchmark to the Graaf perf executable Open

good first issue performance

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

bobluppes/graaf#450 · 1 comment · Opened Sep 19, 2026
adm_cm AVX2/AVX-512 narrow accum_h to float before dividing, unlike accum_v, accum_d and the scalar Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Netflix/vmaf#1608 · Opened Sep 19, 2026
macOS: every obs-websocket GetStats leaks ~200 autoreleased objects (os_get_free_space has no autorelease pool on the websocket thread) — ~2 MB/min at one poll per second Open

Difficulty 1/5 Under an hour Newbie friendliness 92/100

obsproject/obs-studio#13918 · Opened Sep 19, 2026
Chromium: excessive layout time with many math previews due to unused CSS anchor Open

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

TypeCellOS/BlockNote#3098 · Opened Sep 19, 2026
Picker: consider a faster path for agent status than shelling out to claude Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

craftzdog/tmux-claude-hatch#36 · Opened Sep 19, 2026
`benchmark-diff.sh` truncates fractional part of benchmark deltas Open

bug good-title

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

objectionary/lints#1493 · Opened Sep 19, 2026
bench-compare.sh reports the lower middle value as the median for even samples Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

objectionary/phino#1340 · Opened Sep 19, 2026
Filter containing `!=` not pushed to `scan_iceberg()` Open

A-io-iceberg

Difficulty 2/5 1-3 hours Newbie friendliness 90/100

pola-rs/polars#29388 · Opened Sep 19, 2026
[collector] Nginx collector recompiles constant regex patterns on every collection Open

bug

Difficulty 1/5 Under an hour Newbie friendliness 92/100

apache/hertzbeat#4388 · Opened Sep 19, 2026
OffloadedWeightsLoader initialization scans CPU keys for every disk weight Open

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

huggingface/accelerate#4280 · Opened Sep 19, 2026
Five `du` runs and a full `diff` per class run even when `HONE_VERBOSE` is false Open

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

objectionary/hone-maven-plugin#1041 · Opened Sep 19, 2026
[Perf] PTY dispatch copies a one-watcher sidecar Set for every chunk Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

stablyai/orca#21622 · 1 comment · Opened Sep 19, 2026
lookout rebuilds a sysinfo System every second instead of refreshing one Open

area: lookout enhancement good first issue help wanted perf priority: P3

Difficulty 2/5 1-3 hours Newbie friendliness 85/100

shep-pm/shep#517 · Opened Sep 19, 2026
bark clones a whole Trigger per rule per event to match it by reference Open

area: dogs enhancement good first issue help wanted perf priority: P3

Difficulty 2/5 1-3 hours Newbie friendliness 87/100

shep-pm/shep#512 · Opened Sep 19, 2026
A followed bleats scans the whole process cache once per log line Open

area: cli enhancement help wanted perf priority: P2

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

shep-pm/shep#511 · Opened Sep 19, 2026
Avoid Kotlin reflection in KotlinReflectionUtils.isSuspend for methods without a Continuation parameter Open

status: waiting-for-triage

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

spring-projects/spring-data-commons#3544 · Opened Sep 19, 2026
[Bug]: Project favicon lookup probes ~30 paths one at a time, so a slow disk stalls assets.createUrl for a minute Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

pingdotgg/t3code#12542 · Opened Sep 19, 2026
shep-daemon: `watch/filter.rs`: `build_glob_set` forces every caller to allocate `String`s it never needs Open

area: daemon duplication enhancement help wanted priority: P3

Difficulty 2/5 1-3 hours Newbie friendliness 90/100

shep-pm/shep#452 · Opened Sep 19, 2026
glob_to_regex compiles the pattern twice and clones on every call Open

area: core duplication enhancement good first issue help wanted priority: P3

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

shep-pm/shep#381 · Opened Sep 19, 2026
The bark ring's eviction loop is quadratic twice over Open

area: core duplication enhancement good first issue help wanted priority: P3

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

shep-pm/shep#378 · Opened Sep 19, 2026
Clone vip-go-mu-plugins with --depth=1 Open

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

alleyinteractive/create-wordpress-project#218 · Opened Sep 19, 2026
perf: parallelize documentation file reads in scan_repo() Open

enhancement

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

yunaremaia/driftcheck#181 · Opened Sep 19, 2026

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Performance Good First Issues

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