Performance Information and Tools lists your computer’s Windows Experience Index base score, which indicates the performance and overall capability of your computer’s hardware.
You can go to Control Panel ,then click Performance Information and Tools to rate your windows 7 system.

Now in the new windows,you can click “Rate this computer” to test your PC’s performance.After that you can see your PC’s score about this testing.

From the above image we can find the rating give us a base score of our PC ,also separately test the performance of:
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Processor
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Memory
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Graphics
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Gaming Graphics
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Primary hard disk
Tips:You can click Advanced Tools ,then click Clear all Windows Experience Index scores and re-rate the system to re-rating your windows 7.

to speed up win 7 do this
Clean Windows Registry :
Defragment your PC to increase computer speed:
Add more RAM to Speed up your computer
Clear Cache, history and temporary internet files
Turn off unnecessary programs from start up:
Have low intensity graphics
Uninstall unused software and programs
Please remember to clean Windows registry using registry cleaner reg in out
The above guidelines were really helpful to speed up my computer. These are safe and do impact computer performance in a positive way.
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