A confession. There is so little major difference, between Windows 8.1 and theTtechnet preview, that I have become rather disinterested in it. I am a dedicated and enthusiastic poster in discussion and help, where problems are encountered. Of late, on all the forums I visit, the posts on these subjects, have become sparse and, on a couple of forums, non existent. Although a close replica of Windows 8.1, with a couple of visible additions, does this mean the OS is close to perfect, or too boringly similar to its predecessor? For the moment, I am re orientating, as my priority, back To Windows 8.1. An occasional visit to Windows 10 forums will be in order, just to keep in touch, whilst I await the next exciting (??) build release. By the way, if anyone is curious, here is a list of the ongoing builds: https://buildfeed.net/ I am informed that the Flight level - low are the most likely builds for public release. P.S. Just thought to add. My test environment two identical medium performance i5 laptops. One with Windows 8.1, the other with Windows 10. Both have standard hdds One i7 Stationary. 8gbs ram SSD. This is my "daily" computer, with 8.1 I don't feel it is useful to test the preview on the ssd. The speed is fast enough to make visual speed assessment impossible. I do think there is an improved response all around, but this could be due to the, so far, lack of extra services etc, which are not yet incorporated, or running. For me, IE is most definitely more efficient. I use the start screen as my start menu, so have little interest in that particular improvement.