why doesn't IIS have compression turned on by default [closed]

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i am reading articles like this one and this one to walk through the (tedius) steps to turn on gzip compression on IIS (6.0 in this case). I don't understand why IIS would turn this all on by default. Who would not want to compress files going down to the browser ??

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Anyone who understands that compression doesn't always improve things wouldn't want it turned on by default.

It takes CPU time, and may not actually reduce the number of bytes sent significantly.