the freezing and lag on the computer is affecting my productivity

What I think that you do not maitain your PC very well. After that heating problem now this. Some times if you use your PC for long hours it also perform slow. Also like regular check ups for human body PC need regular maintace like if you use windows there are tools to keep it fast and healthy, use defragmeter tool, file backup, scan for viruses, update your PC software, use tools like CCleaner, Glary Utilites, clear with all duplicate files, clear your TEMP directory folder, clear your RECEnt folder and many more. you need to do this all this sort of things every 6 months if you use your PC a lot, I mean create a lot of files, install and uninstall a lot of application, like that, by the way if you have a PC then most of us so all of things that usually people do but don't have time to waste to keep your PC fit like human body where people have time to eat junk foods but dont have time to do exercise.

check the registry with registry booster

Thanks for posting this discussion. Glad to know that u were able to detect the issue in your computer and i am sure u must be feeling great after that. of course such issues tend to distract our work on internet and it is always advisable to sort out such problems before they start interfering in other activities. What say?