Since some time (1 month I think) I had this problem, some games were going as low as 20-30 FPS for some second and then returning to the standard 60-80FPS I'm used to getting. However this suddenly became worse. I can't find out what's causing this.
I'm using an HP Pavilion AK112NL Gaming Laptop, I7 6700HQ and GTX950M 4GB, 8GB ram, win 10 Home 1803 (build 17134.112).
This is not a thermal throttling issue, I ran the games in windowed mode while keeping an eye at CPU and GPU temperature using throttlestop, HWonitor and MSI afterburner, fps drops were happening at 75-80C.
Laptop is also set to maximum performance mode. I tried to update both NVidia and intel drivers with no luck, I changed thermal paste 1 week ago, still no luck (but I lowered my temps by 5-10 degrees).
Tried a fresh install today and still nothing.
When the drops happen there is no relevant disk activity. I also tried with games both on SSD and HDD and there is no difference. Still getting FPS drops.
These drops happen on: Warframe, war thunder, Starcraft II, Wreckfest, Euro Truck simulator 2, Grid: Autosport, The Incredible adventures of van helsing, CS:GO and so on. Various genres of games, various type of GPU and CPU load, same problem.
I have disabled Game DVR on windows, removed GeForce Experience and still no difference.
I've never seen something like this in years of PC gaming. Any ideas on how to remove this problem?