[ubuntu] Uneven CPU usage

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http://ubuntuforums.org – Ubuntu 12.04 has a slight lag/stutter and I notice that the CPU load is distributed very unevenly in the System Monitor. I have an Intel Core™ i7-2630QM 2 GHz in my Lenovo Ideapad Y560p. It's a quad core with hyperthreading so it shows as 8 CPUs. CPU 1 usualy has 80-100% load, and CPU's 2, 3, and 4 have about 20%, while CPU's 7 and 8 are usually 0-5%. I can't disable the Hyperthreading in the BIOS because it is a laptop. I watch alot of youtube videos, and it is frustrating watching the videos stutter and skip while a good portion of my CPU is being unused. Is there a way to assign C (Hardware)