How To Increase Computer Speed Using Pendrive/Flash Drive

ReadyBoost

Just plug in a USB flash drive or card and let ReadyBoost borrow it. ReadyBoost is designed to help when your PC's memory is running low. Low memory can make your computer sluggish because Windows, which needs a place to stash data, turns to the hard drive. Flash memory offers a speedier alternative.

ReadyBoost works with most flash storage devices. In Windows 7, it can handle more flash memory and even multiple devices—up to eight, for a maximum 256 gigabytes (GB) of additional memory.

How it Works 
1.Plug a flash drive or flash memory card into your computer.
2.In the Autoplay dialog box, under General options, click Speed up my system.
3.In the Properties dialog box, click the ReadyBoost tab, and then do one of the following:
3.To turn ReadyBoost off, click Do not use this device.

To use the maximum available space on the flash drive or memory card for ReadyBoost, click Dedicate this device to ReadyBoost. Windows will leave any files already stored on the device, but it'll use the rest to boost your system speed.
To use less than the maximum available space on the device for ReadyBoost, click Use this device, and then move the slider to choose the amount of available space on the device you want to use.

4.Click OK.

Source: windows.microsoft.com