Question [Q] Omni 4.4.2 slow games

Followed the instructions and bumped my Xoom up to 4.4.2. So far things seem to be working alright. I downloaded a couple of games I enjoy on my Moto X. Defender of Texel and Brave Frontier. Both seem to be running sluggish. Not sure if it has to do with the ROM or it's just that the Xoom is past it's prime hardware-wise. I was hoping the update would keep it running but I suppose it is 3+ years old. I was also thinking it my be due to the scaling of these games running on the larger tablet screen. Is there any way to contain the game to a smaller space on the tablet? I tried searching around a bit but didn't find anything along those lines.