Sometimes you install add-on which is not used after wards and it occupies space. So you should disable add-on for better performance.
To remove add-on
• First open Internet Explorer on the computer and close other programs. Then click on Tools > Internet options > Program > Manage add-ons.
• We can see the list of add-on. We have to click on the add-on which we want to disable and click “Disable” and then “OK”