Do you know why there is a difference if the dict is accessed inside or 
outside a controller function?

Are there any (fast) alternatives to calculate a dict hash?

The workaround for me would be to not access auth.user_groups and use 
fields in the user table instead (e.g. auth.user.is_admin) which does not 
change the session. If there is no good solution and the code stays 
unchanged I think this should definitely be mentioned in the book. If there 
are many requests the performance loss is probably not insignificant since 
the session is written for every request.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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