Ages ago, I mentioned that wily redraws itself over and over again when resizing, taking up to 10 seconds to complete. Finally, I had look and here is a fix for the version of libXg that I have.
I've not sent it as a patch because I am (and wily in general is?) in a bit of a multiple version muddle.
Replace Redraw() in libXg/gwin.c:141 with the following. It basically checks that there are no more expose events in the queue before committing to redrawing. Seems to work for me, but I'm no X programmer.
static void Redraw(Widget w, XEvent *e, Region r) { Reshapefunc f;
if (e && e->xexpose.count == 0) { f = ((GwinWidget)w)->gwin.reshaped; if(f) { (*f)(w->core.x, w->core.y, w->core.x+w->core.width, w->core.y+w->core.height); } } }