Our newly setup for Windows 8 has problem.
After startup most computers are very slow for 2 to 30 minutes. The cause is the disk who runs on 100% load and has about 1000-4000 ms seek time.
We have 15 Dell 3.2ghz Pentium and the are slow about 2-5 after startup but the newer computer mostly Gigabyt and Asrock with Intel Duo are much longer on this heavy disk load.
We have 2 domain controllers , one 2003 and one 2008R2