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But the main thing here is CCache is included in macOS builds. I kept a fairly small cache size, a regular macOS builds uses ~110MB, and the cache size at 180MB - the reason for this is downloading and specially uploading is not that fast.
Using CCache, I could cut the macOS build time to around half of it, so this should help lower the Apple Silicon usage significantly, which should help us cut on Compute Credits. In my tests CCache didn't cause any issue and it was fairly stable.
port to 3.6.0 branch in #2115.