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It depends on the protocol you are using to transfer files. Usually it is already done transparently. HTTP (and HTTPS) protocol supports on-the-fly compression, provided that both server and client implements it. First of all, client will let server knows which type of compression it supports. Typical HTTP request header includes a line like ...


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In regards to improving compression speed: Parallelize it. http://blog.codinghorror.com/file-compression-in-the-multi-core-era/. Different compression algorithms (like lzop) are very fast. Get optimized zlib implementations. Google intel zlib, for instance. In regards to improving read speed: You will only get close to your rated disk throughput if you ...


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When you are zipping up in the GUI with 7zip you can simply hit the background button which reduces the CPU priority (8 to 4 or IDLE) of the process. You can hit the button again to toggle to the foreground. There are some screen grabs to illustrate here. If you are looking to do this from the command line or scripted, you can do this by using start /low ...


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The naming is a slightly different format, but: for img in *.jpg; do convert -resize 20% "$img" "opt-$img" done



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