There is two ways that I can interpret your statement. First is that you get FPS drops that drops the frame per second as low as 20-30. In this case, I would say it's a common problem, because no matter how good the driver is, Any card will have drops. Placing the game file on an SSD can be pretty helpful, but will definitely not going to fix the issue entirely. The second case, being the 20-30 frame per second as average, I think this is pretty much underperforming, Do you really think it is underperforming?