Windows 8 Logon times default user profile size

With the addition of Chromebooks and other devices that boot in 3 seconds, we are re-evaluating our Windows 8 environment.  Windows 8 does boot up much quicker, but our domain logon times are still 2+ minutes or more if there is no user profile. 
So I took our policies down to the bare minimum to see what is really taking forever for computers to log on.
Using unattend.xml, we use the copyprofile flag to customize the default desktop experience for our users.  The default profile then becomes 185MB and I'd like to try and reduce that to improve logon times when no profile exists.  The
following folders are where the majority of space is being used and I want to know if I can delete them in the default user profile. 
25MB c:\users\default\appdata\local\microsoft\windows\explorer  -  Icon and Tile Cache
40MB c:\users\default\appdata\local\microsoft\windows\WebCache - log files in machine language
7MB   c:\users\default\appdata\local\microsoft\windows\notification 
7MB c:\users\default\appdata\locallow\adobe\shockwave player 11\xtras\download\adobesystemsincorporated
3MB c:\users\deafult\appdata\roaming\microsoft\Bibliography
4MB c:\users\deafult\appdata\roaming\microsoft\Document Building Blocks\1033\15\Built-in Building Blocks.dotx
How fast can I make it?   I used autologon registry keys to logon to a domain account (non-administrator).  Timings are from totally off to viewing the Start Screen. 
The BIOS on our HP 6306 takes about 12 seconds to even start booting Windows 8 and so the total boot time till the start menu shows is 25 seconds with Windows 8 taking 13 seconds to boot and logon.  That is really, really nice. 
So then I added 3 mapped drives (not redirection) and one printer to the group policy and that didn't add any time once the profile was created.
Creating a profile is what really slows down the logon process.  Granted this is much after after the profile is done, but the vast manjory of our machines are public with random students/staff logging on to them. 
More testing to come.

Were you able to reduce the size of the default profile?
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    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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