Oil pump flow

FWIW, Quickserve says 20.5 GPM @ 4200 RPM for my 02 HO block...
 
tryin to get my head wrapped around how that small oil pump can put out 1.34 qts per second in volume , and not cavitate, especially at higher rpms
I know the bypass limits the output to the specified volume and pressure, so after 2400 rpm its not changing much if any, but the pump is still turnin huge rpm as it appears to be overdriven some 44%?
thoughts?
 
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