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KumoMTA maintains a pool of lua contexts so that the overhead of evaluating lua for any given event handler is reduced.

This function allows you to change the maximum number of times that any given context will be used before discarding it.

The default value is 1024.

Making it larger increases the potential for cache hits (and thus lower latency), but increases the potential for increased memory usage.

See also set_max_lua_context_age, set_max_spare_lua_contexts