The reason  they are usually so slow is the processor speed.   There are some 
ATM machines here in the US running a whopping 25 mhz  chip.....yep  and the 
new  fandanlged super duper  whopper  chopper versions slide in at a cool 800 
mhz... Then add in that  some are  RS232/485 linked to a server 500 feet away, 
which by the way is operating the  whole bank. Ohhh, . and let's not forget 
the ones in the grocery/ convenient  stores on the good ole dialup at 9600 baud 
(  maybe)
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