Generally speaking the Core i5 version of the Gigabyte BRIX, which is based on the Core i5-3337U processor, wasn’t overlay fast, at least by desktop standards. However for a computer that measures just 4.5 x 4.24 x 1.18" it was incredibly fast.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips