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Hoist decodePath() call above the matching loop since pathname is loop-invariant, cache compilePath() RegExp results in a bounded Map (max 1000 entries), and cache flattenRoutes/rankRouteBranches results with version-based invalidation triggered by patchRoutesImpl. Based on our internal testing (large app with 400+ routes), this reduces CPU consumed by react-router route matching ~80%.
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Thank you for signing the Contributor License Agreement. Let's get this merged! 🥳 |
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Relative CPU allocation before and after: |
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| return [matcher, params]; | ||
| if (compilePathCache.size >= COMPILE_PATH_CACHE_MAX) { | ||
| compilePathCache.clear(); |
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compilePathCache.delete(compilePathCache.keys().next().value) to not the drop the cache fully, but preferring FIFO?
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This is great as a |
…m patch (#3877) ## Summary Under high request load the webapp spends most of its CPU inside react-router's `matchRoutes`, not in application code. `@remix-run/router@1.23.2` (the React Router v6 / Remix 2 core) re-flattens, re-ranks, and recompiles the entire route table on every request, and with the webapp's ~436 routes that cost dominates once request rates climb. There is no `NODE_ENV` gate, so production pays it too. This adds a pnpm patch that memoizes the parts that depend only on the static route manifest: it caches the flattened/ranked branches per route tree, hoists the loop-invariant `decodePath` out of the match loop, and caches compiled path regexes. ## Benchmark CPU profile over the same load (100 concurrent tag feeds, ~425 req/s), `NODE_ENV=production`, before vs after the patch: | Metric | Before | After | | --- | --- | --- | | Active CPU (self-time over the window) | 28.3s | 18.5s (-34%) | | Route-matching self-time | 19.2s | 7.5s (-61%) | | Event-loop lag p99 | 322ms | 113ms (-65%) | | Idle headroom | 26% | 52% | Application/realtime code was ~0% of CPU in both profiles; the bottleneck was entirely generic per-request route matching. ## Why a patch instead of an upgrade The inefficiency is acknowledged upstream ([remix-run/react-router#8653](remix-run/react-router#8653)). A contributor PR doing exactly this ([remix-run/react-router#14866](remix-run/react-router#14866)) was closed in favor of a narrower fix ([remix-run/react-router#14967](remix-run/react-router#14967), branch caching only, shipped in React Router v7), with the maintainer suggesting patch-package as the interim until the Remix 3 route-pattern rewrite (see [remix-run/remix#4786](remix-run/remix#4786)). We are on the v6-era core and cannot pick up even the partial fix without a framework migration, so this patch is the sanctioned stopgap, and it also includes the compiled-regex cache the merged PR left out. [`patches/README.md`](https://github.com/triggerdotdev/trigger.dev/blob/perf/react-router-route-matching/patches/README.md) documents the full rationale, the safety argument (deterministic, internal-only, bounded caches), and when to remove the patch.
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Hoist decodePath() call above the matching loop since pathname is loop-invariant, cache compilePath() RegExp results in a bounded Map (max 1000 entries), and cache flattenRoutes/rankRouteBranches results with version-based invalidation triggered by patchRoutesImpl.
Based on our internal testing (large app with 400+ routes), this reduces CPU consumed by react-router route matching ~80%.