If hash computation in Javascript is a crucial bottleneck, there are better choices than SHA1-- like BLAKE2s, which is designed to be fast on 32-bit platforms.

If hash computation in Javascript is a crucial bottleneck, there are better choices than SHA1-- like BLAKE2s, which is designed to be fast on 32-bit platforms. If collisions aren't a huge concern, something like SipHash is also possible. https://blake2.net/ https://blake2.net/ https://github.com/dchest/blake2s-js https://github.com/dchest/blake2s-js https://131002.net/siphash/ https://131002.net/siphash/