Performance (fps / lag) problems after Win10 reinstallation?

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My specs are below

i reinstalled win10 a couple of days ago because i might have had a virus on my computer.

I have deleted all partitions and then formatted all again.

after reinstalling I have installed all the drivers on the cd from the mainboard and then downloaded and installed by nvidia the graphics driver.

then again all other programs, and since then I have less fps in games: tested / played games = league of legends, fortnite, gta 5.

in league of legends, in lategame, in teamfights, there were relatively strong lags, despite fps over 60 (70-90 fps with medium low settings (in lategame and teamfights)).
I have a 60 hz monitor.

Fortnite I can't play on ultra fluid and in gta 5 I have z.b. In the new casino even under 60 fps and otherwise on the normal map (gta 5) 60-100 fps approx. (All on lowest settings).

in fortnite it's also very high at 70-90 fps on Ultra and depending on where I'm also under 50 (in the fields of fatal fields).

maybe important to mention: in fortnite, if I set almost everything to low I still have 120 or more fps (I have lured it to 120 fps)

with my computer should be ultra but no problem according to official system requirements and before hats also worked.

I have already asked in the forum "computer base" for help but since then everything was even worse, I was just not helped freezing cold and they have now let me stand there stupid.

There I was suggested to update win10 from version 1803 to 1903 and then update the chipset driver.

I've updated win10 and installed the chipset driver for the b450 tomahawk from msi. Did not bring anything.

then additionally from amd the socket 4 chipset driver for the b450 installed.

since installing the amd chipset driver I have everywhere (also youtube videos, but somehow not that strong) screen tearing and right after installing the amd chipset driver, in a round league of legends, lags were right at the beginning and the lags were even much worse. In the second round it was not like that anymore and now the gelagge is the same as before and additionally I have the screen tearing.

Another problem I have since the AMD chipset driver is that, I believe, only if I have many tabs open and maybe additionally open a game that then the input of letters in text fields jerky. So that it comes with pressed / held button to dropouts and the next letter is only half a second later.

I have, if I did it right by system control, the chipset driver both uninstalled and then only the amd chipset driver installed.

I also uninstalled and reinstalled the graphics driver and nvidia experience.

no improvement.
FortniteGrakaAuslastung100% cpu (20%)
Ryzen7 2700x GTX 970 B450 tomahwak

Ha

Cuck times at the tastmanger what the relatively high percentages are because of it you can see what rake power pulls