roaming profiles - is there a better way (slow login times)

Currently we have 500 users who hot desk and has 1.5 gb profiles

They are all complaining of long login times, as it obviously takes ages to copy this data across the network

I would like to re-evaluate this
ideally i would like to store all documents on the G drive (network Drive)
And when they load my documents, it just loads this drive and does no copying accross
I would also like to use chrome as the main browser and they will all login to get their bookmarks (we have gapps powered email addresses)
I think we would also need to stop users copying files to the desktop, or restrict the desktop folder to a small size like 20MB?? is this possible?

We would probably need to restrict access to install programs, but we recognise some people will need specific software, so how would we handle this.... currently, they install it on their profile and it uses lots of space and slows login times again

I would appreciate some input and advice from people who have done something similar or who may have advice on this and maybe things i haven't thought of
websssCEOAsked:
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convergintCommented:
Any chance that you would be able to use the new User Experience Virtualization that "replaces" roaming profiles?  http://www.microsoft.com/en-ca/windows/enterprise/products-and-technologies/mdop/ue-v.aspx

If not, the only ways you can speed things up would be to redirect their My Documents folder to the network vs being part of the roaming profile.  This is the MS article that guides you through some of the setup: http://technet.microsoft.com/en-us/library/cc766489(WS.10).aspx
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websssCEOAuthor Commented:
The new user experience Virtulization looks interesting
In theory how does this work? do you just log in to a virtual machine profile?
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convergintCommented:
Sorry but I have not had the chance to actually test it, only seen it online in a demo and read about it from Microsoft's website.
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