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Recent optimizations to ngcc have significantly reduced the total time it takes to process `node_modules`, to such extend that sharding across multiple processes has become less effective. Previously, running ngcc asynchronously would allow for up to 8 workers to be allocated, however these workers have to repeat work that could otherwise be shared. Because ngcc is now able to reuse more shared computations, the overhead of multiple workers is increased and therefore becomes less effective. As an additional benefit, having fewer workers requires less memory and less startup time. To give an idea, using the following test setup: ```bash npx @angular/cli new perf-test cd perf-test yarn ng add @angular/material ./node_modules/.bin/ngcc --properties es2015 module main \ --first-only --create-ivy-entry-points ``` We observe the following figures on CI: | | 10.1.1 | PR #38840 | | ----------------- | --------- | --------- | | Sync | 85s | 25s | | Async (8 workers) | 22s | 16s | | Async (4 workers) | - | 11s | In addition to changing the default number of workers, ngcc will now use the environment variable `NGCC_MAX_WORKERS` that may be configured to either reduce or increase the number of workers. PR Close #38840 |
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