The most annoying thing caused by updating to Windows 8 is by far defaulting saving files to SkyDrive. Its even more annoying than all of the Laptops drivers failing to work correctly, I blame Sony for that.
Every time you got to save any file on the computer, or load any file from the normal windows browse for file window – Massive lag. I’m assuming its because its wandering off into the cloud and having a look. The worst decision Microsoft made was to force SkyDrive to be default for Windows 8.1
To remove start, search for skydrive, select skydrive storage, and change ‘Save documents to SkyDrive by default’ to off.