I use a regular 128 colors on my AGA-only 1200 with some nice pictures in it (jpeg, ilbm, etc).
My 1200 don't slow down that much. Even in DBL-PAL/NTSC modes.
All you really need to show some of that fancy wb's are:
-jpeg & gif datatypes;
- cool pictures to show on the desktop;
- high resolution modes.
Here is the catch, high resolution modes eats chip RAM and forces the AGA chipset to double work (that's why those modes slow the things down).
Programs like fblit, MCP patches (1.46 avaliable, 1.47 to come soon) and visualprefs comes to help, but not much in orig. AGA.