First of all, it is not recommended to delete the backup folder of the system, which may make the system lose its self-repair ability and create trouble for future recovery.
Secondly, slimming has little to do with system speed, mainly depending on whether CPU and memory are strong or not. Slimming is just to save space, and improving system speed can be achieved by stopping service, etc., without slimming.
Third, don't delete many useful system tools or seemingly unimportant system services for a little space. In fact, some services can be stopped, but not deleted.
The principle of slimming:
1. Deleting is useless (such as windows messenger, msn explorer, you can delete it completely if you don't use it).
2. Delete what you know, such as the game in the attachment.
3. Try not to delete the backup folder such as dllcache, because deleting it will be very refreshing and it will be very troublesome to restore the system (windows cannot automatically repair it).
4. If you don't need to uninstall the patch package, you can delete all the repair backup packages.
5. Turn off the system restore service (if you feel it is not easy to use) and delete all restore points.
6. Clean up the temporary system files.