Why can Arch freeze?

Question

Arch Linux

Hello. I have a Lenovo G50 laptop. From standard hardware, I changed the disk to an SSD and set the memory bar to 8GB.
The essence of the problem is that, for example, on a video from YouTube, there are slowdowns in the video and sound stream itself after 5-10 seconds. You can also see the brakes if you scroll the contact tape at an average speed, scroll through, scroll through, then brake for half a second and the page is redrawn.
The drivers are x86-video-intel.
Chromium browser, i3 window manager (I doubt that is the problem).
Tell me where to dig.