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A comment on Case Study: Npm uses Rust for its CPU-bound bottlenecks [pdf]. Parent comment

Re:Case Study: Npm uses Rust for its CPU-bound bottlenecks [... by nwlieb on Sunday March 03, 2019 @02:50PM (#19296407)
Some CPU heavy operations like crypto are not put in a threadpool. While it may be running C code, it will block the main thread while executing. See https://github.com/nodejs/node/issues/678

Perhaps the new worker threads may alleviate this, but I'm not sure (it's still an experimental API).

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