Laptops are also bad for benchmarks because there's a lot of state that has to be communicated to reproduce the conditions: plugged in or unplugged, power savin

Laptops are also bad for benchmarks because there's a lot of state that has to be communicated to reproduce the conditions: plugged in or unplugged, power saving settings, and as you mentioned the risk of overheating. But none of that seems relevant here because the ratio of build times should be similar on any modern hardware.