I have only recently begun using Linux as my primary OS on my laptop. I previously ran Windows 7 on it, which generally had decent performance in 3D applications. However, I've noticed a considerable slow down in their native Linux counterparts, so I've started poking around for updated drivers.
Is there any surefire way to ensure that I get the upgrades? Google-ing around leads to suggestions of adding external repositories, occasionally accompanied by stories of ruining their builds in various ways. Also, I've checked under Preferences→Software Sources→Additional Drivers, which reveals an empty list. Any idea where I might go from here?