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KDE team "concentrate the development efforts on compositing. Adding animations for non-composited environments is out of scope of what KWin aims at."(Martin Graesslin).
Yeah, it sounds good, but i think that KDE, expecially with his recent and constant polishment, must have a chance also with older PCs: the facts are that KDE experience without compositing is not the same when compositing is enabled.
I think that would be pretty to see some improvement when compositing is disabled as:

-metacity-like window resizing effect, showing just a coloured rectangle with the new dimension of the window. As alternative a win98-like window resizing effect, showing just the border of the window.

-kde3/win98-like window minimization effect: it's quite sad minimize a window with compositing disabled and can't see where it goes.

Those features in my opinion would be able to improve the using experience with bad driver/graphic card, reducing the weight of the resizing on CPU.

that's all. Sorry for my bad english, hope you enjoy those simple ideas.