This happened suddenly in a certain project. It doesn't lag when ram previewing, it's actually running like normal, but as soon as i try to move the time marker my cursor turns into a loading circle and After Effects says its not responding, then after about 5 seconds it does the same thing, impossible to work with.
What version of AE (down to the last decimal point)?
What computer specs?
What is in your composition?
Does this happen in other projects?