The first method is:
Click Start >> Run (or) win + R ..
Type prefetch in the run box and click ok.
Shift + delete all the files that appear …
Click Start >> Run again, go to% temp% in the run box, and Shift + delete as above.
The second method is:
Click Start >> Run (or) win + R ..
Type Regedit in the Run box and click ok.
Below the Registry Editor box that appears
Navigate to HKEY_CURRENT_USER >> Control Panel >> Desktop.
When you get to the desktop, double-click MenuShowDelay in the box next to it
Right-click >> modify >> Reduce the Value data from 400 to 0 and click ok.