Custom brushes slow down CS4

whenever try use brush, program slows down crawl. instance: open 600 x 450 jpg , load size 175 brush. fine until increase brush size. 175 - 900 ok, brush tip starts lag hell. reducing brush size doesn't help. apparently problem depends on image size. when load same brush , 1440 x 900 jpg, lagging kicks in earlier. tried changing performance settings, no avail.

i'm using cs4 11.01 , windows xp sp3.

got latest video card drivers? card have? vers. drivers? open gl options on or off?

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