OK, so editing JSPs is slow (it's worse in Eclipse).
This will help a little:
Settings -> Editor. In the Virtual Space box, uncheck Allow placement of caret after end of line.
Now edit a JSP, and click somewhere far to the right, well after the last char: your cursor will appear right after the last char!
That's better than in the white space, from which you have to jerkily left-arrow repeatedly to get to the same place.