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rtc interrupt

hello everyone;
i have one machine in which i m having controller c8051f020
i have set time of 2hours and it is decrementing for the test which is done on the machine.
i am changing rtc frequency to less than 1sec so that i can see the change with fastter time.
rtc is used is ds1307.
time is decremented in 1sec as rtc frequency taken is 1 hz which is set in the 0x07 register of rtc
i am decrementing is to 250usec i.e frequency selection is 4.096KHz
again i hav one more interrupt of 4msec (timer 3) which i have decremented to 200usec for the fast operation in which key detection and other processes are done
but still process is slow. and i placed breakpoint in while(1) loop but still it is taking time.
how all this is affected to while(1) loop?
pls explain, what else i can do to decrement time faster,
in case any doubts, pls let me know
regards
good day