Performance :: High CPU Usage From SVCHOST

I just recently installed Windows 10 on my Dell Inspiron Laptop and so far I am not impressed at all - in fact, I am very seriously debating one of two actions - re-install Windows 7 or switching to an entirely different OS.

The reason for reverting to Windows 7/switching OS are as follows:

1) Currently with an idle system (i.e. no applications running at all), an svchost process is using anywhere from 40 to 60% of my cpu. When I did a tasklist on this process the following processes are attached to this one pid: Appinfo, BITS, Browser, DsmSVC, IKEEXT, iphlpsvc, LanmanServer, lfsvc, ProfSvc, Schedule, SENS, ShellHWDetction, Themes, UserMananger, Winmgmt, wuauserv. My question is this - is it necessary for these processes to be run. If they are, then am I looking at only being able to use 50% of my processor (since this one pid is using the rest of it)?

2) For a virus scanner - I am using McAffee and under Windows 7, it took my laptop 24 hours to scan 231 GB of data. Since I switched to Windows 10 (Same hardware, same memory, etc) it now takes my virus scanner over 48 hours to scan 231 GB of data.

3) If I had not been poking around and trying to change my update settings, I would never have found out that Microsoft expects their users to update the windows of the other users (Microsoft calls it Dynamic Updates). Now this is all well and good if some one had said something since I would have loved to know about it sooner since I am on a metered service.

4) Some of the programs that comes with Windows 10, I have no use for but yet I can not un-install them (Cortana come to mind).

5) It appears that even though I have turned off "Live tiles" the tile continue to update from the net (again - it would have been nice to know since I am on a metered service).

The only option that I know of is to revert back to Windows 7 or switch to a new OS.