I'm sure you have plenty of time for detecting pulses and calculating
what should show on the display

The 7211s are latching drivers with their own backplane output
(you are using discrete segment LCDs ?) so they take just a few
instruction cycles to update and apart from that need no software
maintainence. I use an ICM7211/SP505 combo for digital timers
with 100us TMR0 IRQs. Your timing requirements seem to be
much less demanding, and that gives you flexibility with the
software, especially with regard to jumping out of loops to detect
pulses or do calculations

Instead of aiming at a fixed timing base, try using the time between
pulses (as measured by IRQs) to get a moving average, as done
in rev counters. This would allow you to update the display with new
data as a pulse comes in. The time between it and the previous
pulse can be divided into 60 seconds to give you the display data

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