I'm playing the Binding of Isaac demo and the game is lagging. I tried changing it to low to prevent this, and it worked, except that the quality keeps changing back to Auto on its own... Which means that from there it cycles between all of the different qualities. The annoying thing is that the lag from adjusting the quality is worse than the lag I experience on high quality. Sometimes the quality stays on low for a few minutes before switching back to auto, and sometimes it changes automatically, but I can't seem to get it fixed permanently.
I'm skeptical about buying the full version because I don't want the same problem there. If the full version has this issue too, the game will be unplayable for me.