Windows 10: slow texture loading in games after windows 10 install

Hello,
recently I decided to perform a clean install of windows 10 on my acer Aspire 5 after I got a BSOD and blank screen at boot . I created a windows 10 installation from MS website and everything went fine. Until I noticed that my games suddenly became choppy with lot of hiccups and textures not rendering. Games run at 50-60 fps but drop to 0 fps (freeze) for a few seconds whenever new textures are being loaded. It's very noticeable in GTA V where textures and objects would appear 2 feet in front of me, when driving they would just disappear and make the game freeze until they're finally loaded. Also noticeable in fallout 4, doom 2016 and quake champions, where the game goes from 60 to 0 fps every few seconds, until one area is fully loaded in (after walking around). In star wars Batlefront, every time a new NPC or player appears, game drops to 0 fps. Basically every game has the issue.
I suspected a vram issue , monitored gpu usage with hwinfo64 and gpu Z, says everything is fine. Benchmarks also show that my CPU, GPU and Ram are normal. considering the problem appeared after a windows 10 clean install... it can only be software...

things that I've tried :
-reinstalling newest cpu , gpu drivers with DDU
-reinstalling motherboard drivers
-reinstalling latest directX
-reinstalling the games
-reinstalling everything on an SSD
-cleaning the fan and changing thermal paste
-updating the bios
-set power plan on "performance"
-ran malwarebytes scan, no virus found
-called acer customer service , waste of time

No apps are running in the background, cpu usage is at 5% outside games, ram 15% and disk 5%.
I monitored my temps in games and they are around 70C (same as before) for both cpu and gpu.
I don't know what to do anymore. My laptop used to work perfectly fine with the factory firmware and before the bsod...

I bought this laptop in July and I really saved for a long time to buy it .. any help would be greatly appreciated

specs are : core i3 6006u, 940mx Gddr5 (2gb), 8gb
ps: sorry for my english as it's not my language

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slow loading textures in a few games

Guys, i'm really Discouraged and disappointed about it. I bought my pc about 4 months ago and as far as i remember everything was fine, but now, it really freaks me out...in games like mafia 2, far cry 3, AC:black flag and AC:unity i occurred the problem of slow loading textures: people and cars pops up out of nowhere, shadow textures changes, houses and street textures changes.
fps in most games is good, in black flag and fc3 i have 30-60 fps(i think it is good, after all, its ubisoft, u know..), mafia 2 with vsync i lock on 60 and without over 100, and in ac:unity its 30-40(which is, as far as i know, good for my specs).

does anyone familiar with this problem? is it normal? can someone please help me?

Specs:
intel i5 4590 3.3GHz
12gb ram
sapphire r9 280x vapor-x DDR5 3GB OC (UEFI)
gigabyte H87-HD3 motherboard
FSP 650w PSU

examples from far cry 3:

1. look on the shadows on the grass:
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2. look at the view, all textures slowly loaded:
[video=""][/video]