JSMin (and other compressors) often cause terrible, hard-to-understand bugs in sloppy code. Passing JSLint helps avoid a lot of those problems.

It is a little bit of a stretch. I'd guess that proper use of variable declaration, which JSLint enforces, could make more efficient use of memory. It also doesn't tolerate idiosyncrasies like missed semicolons which might amount to a touch less stress on processing.