Thanks for the review! It's not really supposed to take 20 seconds, maybe one at most, can you tell me what kind of computer you use and which page you tried?

*Edit: Unfortunately, I cannot reproduce this problem, on my machine it takes less than half a second on this page. My best guess is that Firefox's regexp library doesn't work well on your CPU (this add-on is fairly demanding on regexp performance). Not sure what to do about this, sorry :-(