Why does Chrome slow down when hardware acceleration is enabled?

Question

Google Chrome

I turn on several high-quality videos on several tabs with hardware acceleration turned off - everything is fine, not a single lag.
As soon as hardware acceleration is turned on, chrome starts to play non-stop, even with two tabs, if at least one of them has a high-quality video running.
The video card was tested with a prog with a hairy donut - everything is super-nishtyak.
System itself:
Windows 10x64
Processor: intel i-5 3.1GHz
RAM: 12GB
Video card: Radeon R9 200 Series