Hello
I just installed the new version as well and I too am experiencing major slow downs with the new theme, probably due to the fact that a lot more system resources are being used. However, when i switch back to the original theme, everything run perfect (thanks for leaving this in). I think this is something that definitely needs to be looked into.
Also i agree, that with the SNES games, something needs to be done with the box sizes. If you have Famicon games, combined with regular SNES games, the Famicon boxes, when resized, look way huge compared to the SNES boxes. This makes the overall layout look weird.
My system: 2.4 ghz with 8gb of ram