Even knowledgeable performance experts make the mistake of throwing more resources at work. If 10 buffers are good, 15 would be even better, right? If we have more batch work, throw initiators at it; it will get things moving faster. But it turns out that overinitiation is very similar to putting up more toll collectors on a bridge. Immediately after the toll is paid, the lanes have to shrink to the number that fits on the bridge. If you have too many toll takers, the merge following the toll gets crazy, accidents can happen and no one is moving fast.
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