Any way to make quickpay quicker?

Summary:

The quickpay calculation takes a highly variable length of time to run, but is rarely actually "quick"

Content (required):

The quickpay calculation is not especially quick. Sometimes it might take 10 seconds, other times 30+ seconds. Users generally expect a single person calculation to be virtually instant, given the power of the system, and this does not go down well in demonstrations.

Is there any way to speed it up?

Version (include the version you are using, if applicable):

23A

Code Snippet (add any code snippets that support your topic, if applicable):