This is how you end up with "the performance sucks if you don't use chrome" complaints though.
Not it isn't. You get that by only testing in Chrome, and not putting the work in for other browser users. If you test in other browsers and the performance sucks then you should work to make it as good as possible in those other browsers as well.
Aiming for the same experience everywhere is how you don't use things like the 'contain' hint because it's not available in Safari, and then everyone gets a slower website because of it.
Don't undermine every user's experience just because one browser is lagging behind.
Not it isn't. You get that by only testing in Chrome, and not putting the work in for other browser users. If you test in other browsers and the performance sucks then you should work to make it as good as possible in those other browsers as well.
Aiming for the same experience everywhere is how you don't use things like the 'contain' hint because it's not available in Safari, and then everyone gets a slower website because of it.
Don't undermine every user's experience just because one browser is lagging behind.