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I am doing CPU-intensive work on my Thinkpad X220 laptop and I find the performance bad. Interestingly, the CPU becomes more powerful if I disconnect the AC power and run only on battery! It does slow down after a while though, probably because the CPU gets too hot.

Still I find the CPU too slow and I need to increase its performance somehow. I installed jupiter manager, but setting cpu to maximum performance from it did not change anything.

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I had the same problem when I bought an extra power supply for my laptop (for my bag) Turns out that some 'replacement' power supplies have a lower max watage and the computer senses that and then throttles the CPU. In my case, on battery=full speed, original adapter=full speed, new adapter=throttled.

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