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.
You do software updates to get the most from favourite programs right? Updating a motherboard BIOS can in a timely manner is also critical. The guide to Flashing a Motherboard BIOS spells out the often complicated steps in plain english. PCSTATS Tips