Low HDD performance

Solution
press your windows key and type CMD, then do ctrl+shift+enter to open cmd as admin

do "chkdsk /r"
type "N", do not force dismount
type "Y", schedule chkdsk on restart
then restart your PC
press your windows key and type CMD, then do ctrl+shift+enter to open cmd as admin

do "chkdsk /r"
type "N", do not force dismount
type "Y", schedule chkdsk on restart
then restart your PC
 
Solution