After effects being extremely slow

I have been using after effects for the better part of a year, and for the last 2 months it has been excruciatingly slow, I use quarter, and even then it's 5 seconds for one frame, and when I check what frames take the most time, it's usually just text with glow even though I havent had a problem with it ever. Also when I render frames, the previous as to what I just render get un-rendered? It also crashes a lot on random. I reinstalled after effects several times, I restart it every 5 minutes, I purge and clear media and disk cache all the time, and then when I open the memory details, it says that there are two instances of ae running and that exceeds the allowed ram? I checked the task manager and only one instance of ae is open, so If there is anything I can do, pleast tell, thanks