Like many others posting here, the latest release of Lightroom appears to be one savage cockup that for some reason was not tested properly for performance issues. For me the software runs fine for a few minutes then starts to slow savagely to a point where moving between photos and editing is horribly slow. This needs sorting as soon as possible people at adobe and please test your product before releasing it.
As an fyi I do not use GPU acceleration in LR or in Bridge and my pc spec and setup exceeds what is required to run LR efficiently. I have also updated to the latest driver for my graphics card....little to no effect.