Does it speed up my computer if?

Well to speed up your computer you may stop the unnecessary start up process. Run 'msconfig' and then select the process you wanna stop. It would really boost your computer speed to quite a good extent.

Yes it will. Cleaning all the dust in your cpu, will decrease the power consumption and increase the performance of the processor. If CPU had dust in it, then fans may not cool the processor properly, which causes the fan to rotate at maximum speed to coll the processor. If we removed that dust, then fan can cool the processor, means, low power consumption as fan rotates at low speed. If processor is working at high temperature, then its performance will be decreased. If you clean these fins, then your processor will run at optimal temperatures. Typically everyone needs to clean their computers atleast once to twice in a six months. Thank you.