why does the lcd display so lag.

we are using H7202 an Arm7 chip(70MHz) to run linux. When we use
X with LCD whose resolution is 640*480 and 8 bit depth, it is too lag
to run smoothly.
would it be better when we use 320*240 resolution? how would i
change the resolution? i used fbset to set xres and yres to 320 and 240
seperately, a quarter of display is working. that's not what i wanted.
Any help would be apprieciated.

.

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