Will 2D pixelation in Epsxe plugins be solved?

I'm currently playing FF9 with epsxe and Pete's Opengl plugin 1.51
However I notice that as I increase the resolution, the polygons look better but the prerendered backgrounds look worse as pixelation increases with resolution. Which is the opposite with 3d this gives the funny feel that your character is walking on a painting and the feel of realizim drops. FSAA seems to cause lags and pauses at times and but bilinear filtering on 2d causes weird glitches to happen. So bilinear filtering for 2d is left out. Is it a solvable problem? 2D in its default res of 320 X 240 looks alot better but 3D polygons gets all the pixelations. Is any programmer here investigating on this problem?

Your replies would be appreciated.