I spent the evening learning how to mark up equations with labels and use references, following the advice here. However, this probably took about twice as long as it ought to have, because it seems that writing an answer using this feature causes my browser to nearly grind to a halt trying to render the answer (even if I switch to another tab). I ended up doing most of the editing offline, and then trying to make the necessary adjustments after pasting in the code.
Is this to be expected? (I'm using Firefox on Linux, in case it matters.)
Are there any "tips" to alleviate this problem?