Making pages scroll smoothly is super important and :hover does not play well
with scrolling.
Why? [Because painting is really
scroll a page fast, it leaves a trail of required repainting underneath the cursor as the document flies by. This makes the page janky. We dont like jank.
For a fix, roll on over to https://plus.google.com/+MalteUbl/posts/NsyYKenqYNP