Hi, i installed deepin to my SSD and since that it's boot fast but i have when i start programs or switch browser window it is often laggy, even if i start a hd video on youtube it is a bit laggy when it start

PC infos:
- Kingston A400 (120gb) (https://gadgets.ndtv.com/laptops/reviews/kingston-a400-ssd-review-1710839)
- got 8 gb ram (wich not really used anyway, often i use only 4-5 from 8)- pc have a seconday SATA II hard disc (160gb with 2 partition)
- i have AMD triple core CPU
- i connected 2 monitor/display


Other infos:
- i turned off SWAP drive

- idk if it is normal but cpu useage is jumping to high % if i open a youtube hd video (20% => 80%)
- i used deepin like secondary os before and my main os was based on ubuntu 16.04 and that worked alot better even if i opened more youtube video, never experienced similiar laggs with that os.



Question:
- why do i have this laggs, lok like can't manage correctly my vga...

- i think maybe because could be problem with vga driver?


i like deepin really but i don't know how to get ride on this weird lagg problem what i never experienced with ubuntu :/