Why videos and scrolling have a low frame buffering(freezing) on Ubuntu Budgie 18.04 LTS and how to fix this?

Unfortunately,since I moved to this linux distro my screen has a buffering issue when I use whatever kind of browser and when I play any video with or without a browser.The screen runs like chopped up or freezing(I don't know if buffer is the same as freezing,but its certainly freezing,videos are running like taking pictures every 2 seconds).I need to know if have a solution to this issue by a properly software for linux cause I don't want to buy a graphic card now.Thanks! PS:My motherboard is a Gigabyte VM900M(rev.1).