hi therax,
i've been doing some testing of various inserter configurations for miniloader strictly from a UPS perspective, and secondary concerns to consistency.
in the least optimized test case of infinity chest -> miniloader -> belt -> miniloader -> infinity chest (void):
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with blue express miniloader (45/sec), the Lock stack sizes option does not greatly impact performance, this might be due to some internal engine changes since my testing on 0.18. I haven't tested this with the map I was using at that time, which had much faster miniloaders (~180/sec).
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Disabling ElectricNetwork usage is the easiest way to knock 1.5ms off of my contrived test map.
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chases_belt_items = false, reduces the minimum UPS consumed by miniloader by 1ms, does not change the maximum, and increases the average UPS by .5ms.
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combining chases_belt_items = false with unlocked hand stack size gives the best performance despite increasing avg by .3ms, the minimum is reduced by 2ms.