I got last summer a Toshiba Qosmio laptop with Windows 7 64 bits preinstalled. It just works very poor. It feels... choppy. Compiling a large program 4-5 seconds. All programs are less responsive.
On Windows 32 it takes 1.5 seconds. It seems to be because it takes quite a while until the CPU frequency switches from low power state to 100%. Is this a know problem with all 64bit OS?
Initially I worked with the software/drivers preinstalled by Toshiba (an believe there were few GB of garbage preinstalled). Then I reinstalled and I put only the (minimum set of) drivers and no garbage utility software. The laptop is as choppy as before.