I don't know if this is a bug. Maybe it's just my operating system (ubuntu 10.10), computer, or browser(Mozilla 3).
As of yesterday, I can write answers very hard. I noticed that before, the latex text preview didn't get compiled until I stopped writing for a few seconds. I think that from today the compilation takes place as I write, and that makes writing go very slow after the text becomes longer than a few paragraphs, and I have five or more formulas. Has anything been changed in the system, or it's just my computer doing something wrong?
Has anyone encountered something similar?
 Don't know if it is a good idea, and I am not in the place to say it, but in MathOverflow there is an option to disable math preview. Maybe this could be implemented here also, but if I'm the only one who has problems with this issue, then it is ok as it is.