At the last Railsconf 2012 there was a separate report about sass, where they announced features that are currently being worked on and which will appear in the next release:
1. libsass - C compiler written in C sass, working faster by orders of the current Ruby script. For large projects, this is very important - large volumes of styles during a Deploy compile well for a very long time (half a minute and longer). It will also allow you to write bindings for libsass to other languages, which means more simple embedding of sass into python / node / dotnet / php frameworks.
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Source: https://habr.com/ru/post/144419/
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