When using the start menu the you will notice a delay between different tiers of the menu hierarchy. For the fastest computer experience possible I recommend changing this value to zero. This will allow the different tiers to appear instantly.
STEP-1: Go to Start >Run >then type Regedit.
STEP-2: Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
STEP-3: Select MenuShowDelay from the list on the right.
STEP-4: Right on it and select Modify.Change the value to 0
STEP-5: Reboot your computer.
STEP-1: Go to Start >Run >then type Regedit.
STEP-2: Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
STEP-3: Select MenuShowDelay from the list on the right.
STEP-4: Right on it and select Modify.Change the value to 0
STEP-5: Reboot your computer.