Old iMac27 very slow with Windows 10 installed directly on SSD

[jojoLED]

Hi guys, I just wonder if anybody did install Windows 10 or similar DIRECTLY on SSD in iMac 27 mid 2011 or similar, and the PC then was super slow?

Did anybody manage to fix it somehow?

It helped me alot to delete all devices as Bluetooth, printers, fax, modem...but still I remeber how fast and solid it used to be with SnowLeopard, and this is far from it...opening chrome window makes the CPU to spike to 100% for short time...basically everything spikes the CPU to 50+%

Benchmark results https://www.userbenchmark.com/UserRun/68606746 shows my feelings are right :

as SSD is not performing as normally it does

as GPU AMD radeon is very very poor

as CPU doesnt feel solid

...it all brings me to Motherboard Intel P55...

...none of the devices above I was able to install drivers I found officially on internet...for whatever error (not compatible, not found, etc)

Did anybody fixed this and improoved its performance to how it should be? ( I know windows will alwayes be slower, and slugish) ....any tips?