Yeah the fbcode build system was hella slow. A minute plus just to build the "action graph." I did marvel at all the lost productivity, especially since an minute plus is enough time for me to context switch to another task, or at least go get (another) cup of tea...
Mercurial / Eden were pretty fast though. Never had complaints about them.
Source: Was a Meta infra engineer until last month, working in CDN & LogDevice, among other teams.
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