Does DFS Use A Lot Of Resources?

Hello,
I have set up a test environment in which I have a single server with 4gb RAM currently running Active Directory Domain Services with only 2 clients and it runs fine (only using 990MB). I am intending to install SQL Server on it and limit it to 2gb ram.
As well as these, I would very much like a domain-based DFS Namespace (I am not bothered about file replication) but will all three roles be able to run efficiently with only two clients? I don't want it to be really laggy taking ages to process logon requests
and SQL queries etc. I would rather have SQL and AD run fine than have a DFS as well and have them really slow.

Hi,
The DFSN service typically requires very little CPU and memory to service requests, even from numerous clients. 
However, as the size of the namespace grows, the DFS service uses more memory, so consider using more than the minimum recommended RAM for servers that host large DFS namespaces and for servers that host multiple DFS namespaces.
For more detailed information, please refer to the article below:
Designing a DFS Namespace
http://technet.microsoft.com/en-us/library/cc758931(v=ws.10).aspx
Best Regards,
Mandy 
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