How can I delete my computers history faster?

What browser are you using?

In the history press ctrl-A, then the delete button.

Tools > Clear History

For most browsers

You should also be able to go into your browser’s preferences and set them to automatically delete your history either after a certain time period, or with Firefox at least, you also have the option have it automatically clear your history every time you exit the program if you want to do it that way.