Hi, All, I have an all in one Samsung Intel Core i5-3470T 2.9GHz with 6GB Ram. The computer boots up fast (about 20 seconds) but very slow waking up from sleep. Also slow switching users. After slow waking up and log in usually it's quite slow for a minute or two after which it returns to normal. It's fairly fast starting and using apps. So sometimes it takes 5 to 10 mins before the PC is useable again. I setup multiple users on the machine sometimes two or three users logged in. When it's slow after logging in the performance monitor shows minimum CPU usage. I reinstalled the OS once it was fast for a while then the problem came back. Can someone please advice? I am almost want to return to Windows 7 due to the performance issue.