Computer is glitching out on webpages and games?

So, this has been going on for a while. After I was on a webpage (I think it was Kongregate.com) and my webpage started to not respond and begin responding again like in less than a second. It is not responding from anywhere from.001 seconds to 4 seconds. I thought I got a virus so I decided to download malware bytes and CCleaner and I checked for malware/viruses before I downloaded it. I did catch a lot of viruses and cleaned over 2 GB of space. I thought I fixed the problem but it turns out I didn't I've been trying to fix it ever since and all my efforts have been futile. I've uninstalled my browser and scanned it many times but yet nothing has worked. Also for example Minecraft. It does the same thing. Please give step-by-step instructions for me as I'm not the brightest out there. Thanks guys!

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