Unity 3.5.6 loads very slow into Windows 8 Pro 64-bits and I get a message saying that I need to download a patch from Microsoft. Unity 4.0.0f7 loads fast into Windows 8 but Unity 4.0 isn’t compatible with some projects created using Unity 3.5. Any suggestions?
Slow for me too. Same system (Windows 8 Pro 64 bit. I’m using Unity 3.5.7f6). The message you get about needing a service pack because of 64 bit windows is bollocks. Same message started appearing in windows 7 ages ago. Most likely not related to the slow start up, since Windows 7 Unity loads perfectly quickly.
Sorry, I don’t actually have an answer. Was hoping you would 