If your chat-message filter is more CPU-intensive than average, or does more with a message than just filter it, you don't want it running on spam when a faster spam-filtering add-on is present. You can post-hook ChatFrame_AddMessageEventFilter, but if multiple add-ons are doing that then it takes an exponentially-growing length of time.
That's where AddMessageEventFilterLast can help! It keeps the filter functions using it at the end of list.
The AddMessageEventFilterLast Team
