10 seconds of stop-the-world GC in Go: https://groups.google.com/forum/m/#!topic/golang-nuts/S9goEGuoMRM Yikes.
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A fun idea for a Ruby test runner: run all the tests, most relevant first, but never run for more than 1.8 seconds!
Compile times of 30-60 seconds are particularly challenging: they're too short to do something else, but too long to get into a flow state.
I find music helps avoid context switching at least.
Every time I make difftastic faster, people give it larger files!
Performance is adequate these days (I've not seen >10 seconds for several releases), but I was even forced to look at scaling of the textual diffing parts :)