Well, I got the JPEG decoding speed running very fast. However, once I add in some game-generated video overlay, performance drops from 100 FPS down to 85 FPS. This was a bit of a red flag for me since OpenGL is supposed to be, well, fast!
So I am making a goal to get performance back up to over 95 FPS (or better) with the overlay active. I've found some areas of potential optimization that I can do.