I couldn't fix the problem myself, and I decided to ask here, I really have no idea why and what is happening, so I hope someone could help.
I have a game, that works fine for everyone and worked fine for me since the last time I tried it, less than a month ago, but all of a sudden, now when I run it, my PC slows down to the bare minimum, I barely have a FPS for about 4 minutes, and then the game launches and everything is fine, like nothing happened.
So I wanted to diagnose the problem, the game is legit, scanned with Avira, MWB, Virus Total (all though only the exe), everything is great, people do not have this problem with it.
Now I really wanted to understand what is going on, and what I did first, is I tried it running it of an SSD, same, I then checked it with Process Explorer, nothing showing up, usual CPU numbers going up at some point, NOTHING else is wrong, GPU stale, everything excellent. I have a fairly OK PC. I7-2600, R280x 3GB, 850 evo, but I know that is not the problem as this game runs normal after finally starting.
I tried Rkill while running it, updating my Windows, scanning it with MWB and Avira, JRT, hitman pro, process explorers not popping anything, event viewer - not a single thing, without internet (for some reason). No fix, yet people don't even meet this problem.
It is bothering so much that I cannot sleep, just because I really want to diagnose what the hell is wrong with the 4 minute PC slowdown, I heard some people having a slowdown for a second or similar, but I literally can go make food and still come back and can't move my mouse yet. Well, after 2-3 minutes, it gets a bit better, like 3-4 FPS for a minute or so. If I ran it from Sandboxie, I get a decent run time, like a minute and a half before the game starts, so it is a bit faster.
I generally want to ask, WHAT in the world could this be, taking in measure that:
-the same game worked perfect fine a month ago, the same program, not a new download.
-tried every diagnostic tool (that I know of), but could not find anything useful.
-no one has this problem, some people have 1-2 second slow down, mine is nearly 5 minutes and the only toaster I own is in the kitchen.