[motohagiography]

Recovering product manager in me sees 90th percentile queries with outlier high latency and starts asking instead of how to reduce it, how we can to spin it out into a dedicated premium query feature, as if they're willing to wait, they're probably also willing to pay.

Highly recommend modelling your solution using queueing theory with this: https://queueing-tool.readthedocs.io/en/latest/

As an exercise in discovering the economics of how your platform works, even just thinking about it in these terms can save a great deal of time.