There is a lot of tangibles on g-zip compression. One of them is the file sizes. If they are small files to begin with, then you do not benefit from the compression all that much ... the savings does not warrant the server overhead either.
I guess there is a balance in there somewhere though. I can see if a lot of your pages are quite large to begin with (like a full page of forum posts for example) then you would benefit from g-zip compression. In fact, compression is built into the phpBB software because of this. It is an option to use it or not via the ACP for phpBB.
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