Don't be mean, zenzen. If you're using any modern version of Windows... Ctrl+Alt+Del, processes, terminate everything that does not seem vital. If your screen turns blue, you've done something wrong.
You seem at least slightly computer-savvy. Do you have a dedicated graphics card? Try rightclicking the tb executable and 'Run with graphics processor'.
This isn't strictly necessary, but Battle Encoder Shirase, while adversely affecting your fps, will force tb, or any other program, to use less cpu time. If you so desire to save it.