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It depends on the type of action, to begin with.
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Often it ends with the type of action, as well.
Sometimes, increasing the gas doesn't result in any appreciable change to the cycling rate it just makes the parts slam harder. Yes its because they are moving faster but the result is dependent on the specific action particulars.
Adjustable gas systems on some belt fed guns are there to provide more gas to keep the action running when it becomes sluggish due to the build up of heat, firing residue, loss of lube or foreign matter found in combat conditions.
Other "adustable" systems are not firing point adjustable, requiring changes in buffers and/ or springs or other parts to change the firing rate.
How much can be changed and how it is done is entirely dependent on the design of the action. There's no free lunch.