Q&A for How to Make Your PC Very Fast

If you are in the game, enter the settings menu and turn down your graphic settings.

Increase your RAM, get a good processor (i3, i5, etc.), buy an Anti-Virus and install it on your laptop (if your computer is infected with malware it becomes really slow), and use disk cleanup to clear storage. All of these will increase the speed without having to revert back to XP.

Try optimizing your disk, cleaning your disk, and stopping useless background startup processes (through task manager).

You can free up memory by deleting old files. However, the problem with the videos is probably a graphics issue and the multitasking is a processing issue.