C5 works OK on SAN, but not on NAS

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My developers tell me that there is a problem with the server.
Something about speed.
I need your expertise! Please *HELP*

1. Status
A. The source code was installed on 'NAS' (Network Attached Storage) of a QA server for server dualization (server replication?)
B. Logged in as admin, there are delays on some particular pages.

2. Detail:
A. Logged in as admin, when we refresh the site (F5), delays occur once out of 3~4 tries, lasting for 30 seconds.
B. Similiar delays occur for images inserted as :http://www.concrete5.org/download_file/view_inline/353/

3.
If they move the whole source to SAN and test under the same environment, the site is accesible without any problem.

Did anyone suffer this kind of problem?
Does anyone know how to solve this?

 
waylonrobert replied on at Permalink Reply
Sounds like there is a configuration issue with the NAS. It may not be optimized to function as a web server.