I've been having problems with threads that contain a fair amount of code, marked with the "Code sample" feature. This thread is a good example. Opening the thread hangs my browser, Firefox 3.6, for many seconds. In extreme cases, it trips a timeout error that lets me abort the script.
Not exactly sure when this started, it has however been very noticeable in the past few days. Responding to such a thread is very difficult too, if I post a code sample myself then the browser goes catatonic again, often multiple times.