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In addition to the default On Function condition, XLua contains several alteranate On Function conditions, which can facilitate separating or grouping MMF functions. These alternate conditions are functionally identical.
Whenever an MMF function is called from a Lua script, either via a registered function call, or through DoCall, every On Function condition must be checked to see if it is the correct function to call. This is not a large overhead, but if you have hundreds of these conditions defined, and you need to call a single MMF function many times per frame in a tight loop, this overhead can add up to a significant amount.
Function groups help mitigate this bottleneck because a function call to one group does not need to inspect the conditions of another group. Therefor registering an MMF function that is called often to a sparsely populated group mitigates a large accrual of overhead.
Copyright 2010 Justin Aquadro