I have dual boot Windows 8 and 8.1 and it is slow till it reaches desktop, it waits 3-4 minutes at the dual boot screen not much activity it seems. And suddenly some disk activity and second monitor goes power on. I have removed the hibernate file with powercfg command. Maybe I should put it back, but I only have 4-5 gig free space left after installing Windows 8 SDK and the Windows Assessment and Deployment Kit. I installed all the stuff on the C:-drive. I also don't know how to check which boot mode I use the fast startup or hybrid boot, don't know how to check this. I am going to read some more about this. I did a powercfg /h on summary_boot.xml