Embedded video setting
If you're using a video port supplied by the mtrbd., it maybe sucking system ram and that takes away from overall PC system ram. Having only 1gb of ram is bad enough but if that is taken from and reduced you'll see less for general PC use. Whether it be in the bios or some Sony video app. that addresses video setup use, check and verify. It may also be available through video preferences setup also. Once you reduce the video ram being used and still looks good, then what was taken is returned to the system, which in turn *may* allow it to run faster. It's a good area to check as some ram is too easily rerouted from system to video use. Basic video ram should be 32mb-64mb for decent viewing, but it could easily be 128-256mb and out of 1gb, you see the results. The easiest fix, is to use a video card in place of embedded video and even install a decent video card at that for desktop models.