CS4 sudden slow down/unusable

[garyw713062]

Hi, booted up my PC yesterday morning and suddenly CS4 has around a 10 second delay. When i can finaly make a selection it is as the moving lines to show your selection struggle to even animate. CS4 boots super fast, scrolling iver menus and tools works fine all until i open up a canvas.

I have CC which still works fine, i have cleared my preferences, done a re-install, tried swapping to full screen (which just caused a black screen and went unresponsive).

I opened CS4 in safe mode and it worked as it should but back in normal boot mode its horrible.

[JJMack · Accepted solution]

Why two threads? Photoshop CS4 sudden slow down/lag issue