This problem only started occurring this morning.
Every time I open a project After Effects, it stops responding. After some time is begins to respond again, but this is short lived. Whenever I now scrub through the timeline or do any slightly strenuous tasks, After Effects stops responding. Similar to the project opening, it does start responding after some time. This makes working impossible, and I would be grateful for some guidance or solution.
I have recently installed a few plug-ins (yesterday), but after installing I was not confronted with this error back then.
Version of AE and your operating system down to the last decimal point? Did you reboot? What plug-ins did you install? Is this happening with all projects?
You didn't give us much to go on. Usually, if the behavior of any program starts changing then you either installed or ran some program that causes conflicts, your memory did not get freed up after you ran some program, your disk drives do not have enough free space, or a component is failing.