Whilst my first option would be to throw those piece of shit speakers in the bin, I guess you would prefer not to do that.

Just check your system resources whilst it happens and find the culprit.

>>52648333
Haha, I'd gladly throw them in the bin, but i can't because it was a christmas present, so I think i gotta stick with'em.

Well, I can only see that the Voltage and Disk graphs show higher peak values, what can this mean?

>>52648399
Just means that your using your disc and pulling more power.

It has to show increase in some kind of process.
Keep task manager open on the top, make your computer turn to shit again. See what is using the most memory or cpu.
Or more importantly, see which one is just climbing up.

>>52648449
Well, Google Chrome was consuming like 600mb out of memory (damn!), now i'm trying to check out what happens if I listen to music on Windows Media Player.
For some reason, it isn't lagging now (apparently, but give me 5 minutes to see how it behaves)

>>52648287
Right click task bar, under advanced options you should see a small check box that says "install gentoo". Make sure this is ticked then restart.

Well, having in mind that the WMP didn't slow mycomputer down, I tried navigating internet with other browser (Pale Moon) and things are going as they are meant to be: everything goes smoothly and there is no noticeable lag.
So I think the main problem was caused by the ram-devouring Chrome.
Thank you all!