That is a JavaScript problem. I have gotten so fed up with the bad JavaScripts here that I just keep JavaScript turned off for this site. It breaks a lot of the functionality of the forum, and it gives me that "are you sure you want to like this post" all the time, but it's still a lot faster than having JavaScript turned on. I was just trying to reply to a post on my desktop computer which has JavaScript turned on, and it wouldn't even let me post the reply. I would just hang when I tried. So I got back on my laptop with JavaScript turned off and I was able to post without any problem.
Isn't the JS that you turn off in your browser the client-side JS? The problem here seems to be server-side, not the client-side?
Most of this stuff would be way beyond me, I was just hoping that explaining exactly where I'm having some of the worst issues might be helpful.