A number of users have reported inordinately slow file copying between folders, across networks, or across local drives. There are a few very simple, very effective fixes for this issue, as follows:
Update your system board drivers The drivers included with some boards may be prone to slow and or corrupt data transfers. Updating your motherboard’s and or various chipsets’ drivers/firmware can sometimes result in a massive speed boost.
Some chipsets from VIA have been known to cause slow data transfer; you can find updated drivers for them here.
If you are using an Intel-based chipset, download and run the Intel Chipset Software Installation Utility.
Turn off thumbnail previews In some cases, turning off thumbnail previews can speed copy times considerably. To do this, open a window in Windows Explorer and click the Organize button, then choose “Folder and Search Options.” Click the View tab, then select “Always show icons, never thumbnails,” then click OK.
Turn off Remote Differential Compression Click the Start button then open the Control Panel and select “Programs and Features.” Next, select “Turn windows features on or off” on the left side, and uncheck “Remote Differential Compression,” then click OK.
This feature is designed to allow data to be synchronized with a remote source using compression, but may cause inadvertent slowdowns in some cases.