Comment by lostmsu
It does. Sorry about the experience, we will try to improve it.
Having user confirm it is not a good option, because every click is a hassle.
What we could do is first run a very short version of a smaller benchmark, and if that takes too long, don't run the main one. Then the worst case you will have a 100ms lag at this point, which is way better than 5 seconds of reading.
It's a neat feature, I just think it'd be ideal to do a confirmation first. It wouldn't be a great experience if it happened on mobile, either.
Every click is a hassle, but principal of least astonishment applies here. Literally not a soul will be expecting that to happen when casually browsing your site.