perf(@angular/build): batch prerender routes and share in-memory server bundles - #33905
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alan-agius4 merged 1 commit intoAug 25, 2026
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This pull request optimizes server-side prerendering by transitioning in-memory files to zero-copy Uint8Array buffers backed by SharedArrayBuffer and batching route rendering requests to reduce IPC overhead across worker threads. It also adds comprehensive unit tests for these changes. The feedback suggests adding an inline comment to explain the batching heuristic formula for better maintainability.
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…er bundles Back in-memory server bundles with SharedArrayBuffer to eliminate V8 structuredClone memory duplication across worker threads and loader hooks. Batch routes dynamically during prerendering to amortize IPC messaging and event loop scheduling overhead.
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What kind of change does this PR introduce?
What is the current behavior?
workerDataas strings, causing V8structuredCloneserialization to copy all bundles into every worker thread isolate and ESM loader hook instance.prerender.ts,renderPagesdispatches individual tasks to Piscina worker threads for each route, introducing per-task IPC serialization and event loop scheduling overhead on large applications with thousands of routes.What is the new behavior?
Uint8Arrayviews backed bySharedArrayBufferviacreateSharedServerFiles, allowing zero-copy memory sharing across all worker threads and ESM loader hooks.render-worker.tsto support batch rendering requests while maintaining backward compatibility and per-route error trapping.Does this PR introduce a breaking change?