To make a long story short: I recently bought a license for Windows 8 Pro, as it was quite a bargain for a limited time (29,90 euros), in order to upgrade my Windows 7 Home Premium installation of my Acer 751h.
The experiment failed: Memory usage always around 90% and CPU more than 75% all the time, with a couple of Chrome pages open, Skype, Skydrive and Sugarsync running in the background. That’s all. Netbook was so slow that was unusable. I was in a project meeting, preparing presentations… tough luck! I got so frustrated that I tried to download various Linux distros (e.g. Linux Mint 13 XFCE and ArchLinux) in order to be able to do at least the basics (e.g. browse online and check my emails; however, there was always some issue with the Linux installations, so I finally gave up…I have tweaked everything that I could (from disabling the Aero theme and system sounds to disabling Indexing in order to save some hard disk spinning time) but it was in vain.
I can only see two solutions now: Either I find a compatible 2GB SO-DIMM RAM module for this ill-fated machine, or I return to the Windows 7 installation, which worked pretty well (at least much better than Windows 8) with this machine.
This was really unexpected as it was mentioned that Windows 8 are not as greedy as Windows 7 regarding memory usage, but since the upgrade to Windows 8 only took place a couple of days before my trip, I did not have enough time to check the performance under real-life operation…