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Fast Post merely side-steps the preview and view of the finished post and appears to just return you to the forum top page. There is more to it, however. The idea of Fast Post is that it does the posting work AFTER your browser gets control back. Usually, when you hit "Post Now!," the hang time that is sometimes encountered is the system waiting for a chance to insert, doing the insert and various other database things.
Fast Post basically queues your post for posting. It will usually appear right away but not always.
It is not meant to be heavily utilized by those who are significantly challenged at spelling.