From my work, there isn't a specific flow that works. Each pool if it is adjustable can alter the flow to suit. To slow (below 26 GPM) and they don't work that well, a massive flow only increases the actual draw by a couple of inches in front of the skimmer. Better to have the returns pushing the debris at the skimmer but some pools have the returns and skimmers at opposite ends and it seems as if the flow from the returns only has a control over a leaf 12-16ft, if the flow is fast the leaf would get pushed out of the main flow to the calmer edges of the flow so often missing the skimmer (assumes a turbulent street type flow pattern from the return). Like going on to a putting green armed with a wood and not a putter.
Although you throttle back your flow to get more heat you are not really. It has more time to get hotter (feels hotter) but there is less flow. Using more flow but a slightly lower temp (un throttled) will heat the pool faster.
A bit pedantic but it's my answer.
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