How fast can zlib be on a slow pc?

I have a 500Mhz CPU and 256MB RAM machine running 32bit Linux.

I have a large number of files around 300KB in size. I need to compress them very fast. I have set up the compression level for zlib at Z_BEST_SPEED. Is there any other measure I could take?

Is it possible to compress 25-30开发者_运维百科 files like this in a second on such a machine?

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You are essentially talking about a 10MB/sec speed. Even if you were to only copy the files from one place to another I would doubt that your slow hardware could do it. So, for compression I would vote No - it's not possible "to compress 25-30 files like this in a second on such a machine".