Overwhelmingly slow compile times in 4.20

Can somebody help me? I’ve already tried everything from reinstalling VS to trying different build settings to reinstalling the engine, but VS keeps getting stuck at “Building XX actions with 16 processes…” and taking up to 10 minutes to even compile trivial changes on .cpp files, to the point where a full rebuild is faster than that. Building from the editor is equally slower than 4.19.
This is really killing my productivity. Since I switched to 4.20, 80% of the time I spent on it has been waiting for compiles and trying to fix the issue.
Thanks in advance.

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