Cache state of Apache GZIPs, are they waste of CPU?

For the 开发者_如何学Pythonfiles that Apache gzips, are they cached or not?

Or it just a waste of CPU every time a request is made?

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It is not cached as far as I'm aware. You can pre-gzip you files and store them on disk manually if you wish. But if CPU load isn't a issue on your server than don't worry too much as gzip is a pretty easy for a CPU to do.