How do you stop annoying lag online game?

When I'm playing online I get great frames per second for the first couple of minutes and my CPU is at 50% but out of no where my CPU usage jumps to 100% and I start getting terrible FPS. What causes it? How can I fix it? My computer is a Dell XPS Gen 5 with 3.25GB RAM and am running on an Internet connection wirelessly. I have 453GB hard drive available.

What is the original space U HDD have? he needs more space


HP Folio 13-1020US 13.3-Inch Ultrabook (Steel Gray)


HP Folio 13-1020US 13.3-Inch Ultrabook (Steel Gray)


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ASUS G53SX-DH71 Full HD 15.6-Inch Gaming Laptop - Republic of Gamers (Black)


ASUS G53SX-DH71 Full HD 15.6-Inch Gaming Laptop – Republic of Gamers (Black)


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Dell Inspiron i17RN-2929BK 17-Inch Laptop (Diamond Black)


Dell Inspiron i17RN-2929BK 17-Inch Laptop (Diamond Black)


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HP Pavilion dv6t Quad Edition Laptop - Windows 7 Home Premium 64-bit, 2nd generation Intel Core i7-2630QM 2.0 GHz, 6GB DDR3 Ram, 750GB HD, 1GB Radeon HD 6490M GDDR5 Graphics, SuperMulti DVD burner, 15.6 diagonal High Definition LED HP Widescreen, Webcam, Intel Wireless-N Card with Wireless Display Support, Fingerprint Reader


HP Pavilion dv6t Quad Edition Laptop – Windows 7 Home Premium 64-bit, 2nd generation Intel Core i7-2630QM 2.0 GHz, 6GB DDR3 Ram, 750GB HD, 1GB Radeon HD 6490M GDDR5 Graphics, SuperMulti DVD burner, 15.6 diagonal High Definition LED HP Widescreen, Webcam, Intel Wireless-N Card with Wireless Display Support, Fingerprint Reader


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