I have been experimenting with taking a series of shots on continuos mode (Canon 500D) e.g. dog running around on the beach & birds flying etc. I have noted that after a few shots the shutter button is unresponsive & the viewing panel is telling me it is buffering.

Now can someone tell me ....does the memory card affect the speed of buffering?

Are the more expensive bodies faster in the buffering department, or is there something else going on R/T operator error