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TypeScript speeds up incremental rebuilds with parallel signature checks

A merged compiler change parallelizes signature checks for files affected by edits to widely imported modules. Previously, this phase processed dependent files sequentially.

What changed

In the contributor’s benchmark, a rebuild after a comment-only edit fell from 3.4 seconds to 1.5 seconds on a 32-core Linux machine. In an n8n package, a comparable rebuild fell from 5.4 seconds to 4.5 seconds. These are workload-specific results, not general speedup guarantees.

Performance and limits

The work is bounded by GOMAXPROCS; gains depend on available checkers and the dependency graph. The change does not help isolatedModules builds, which do not traverse referencing files.

Source