node-sass is to blame for like 95% of these node-gyp issues in my experience, it's not that much grief to deal with but it's hard to grasp how it was allowed to hang around so terribly for so long
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It's not hard. The explanation is simply that the dart version of SASS (the sass npm package) is much slower than node-sass.
At one point it was like 20x slower and I believe right now it's about 2-3x slower.