Your system should easily be able to handle the download of files and a single running CRC check. Even 5400 RPM drives should have no problem with that. Of course it highly depends on the overall system specs and most importantly the download speed of your connection. If you can download faster than your system can write data to disk....
You should try to increase buffers to reduce overall IO. See Settings->Advanced Settings->GeneralSettings.maxbuffersize
set to 2048 for example
Can you tell more about system? What's your download speed? System memory? What disk/model exactly is it?
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JD-Dev & Server-Admin
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