Reply To: Extremely slow performance

Disabling Live Screen Redraw in the preferences should help you get going. I can't imagine what the developers were using — liquid nitrogen cooled octo-core systems with a terabyte of RAM, something like that?

Working in CS4, I also leave Live Spell Check and Autocorrect switches off (as all of my text comes from external sources), and Live Preflight too (since “Dead Preflight” would have been a better name).

Only when I'm finished working on a document I switch Live Preflight on, then go have a cup o' coffee, and come back to read … “No errors”. (At least, on the good days.)