Mavericks (10.9.5) File Sharing Speeds are awful over Gigabit

I was recently hired at a small design business and we have 3 iMacs (late 2011) and a Mac Mini (Late 2012) that frequently need to share files. We are all attached via Gigabit LAN which is verified when I open Network Utility on any of the computers and read the link speed under the info tab. The Mac Mini acts as a file server. Everyone mounts to it using the AFP protocol and uses the admin account's credentials. The Mac Mini is not running OSX server because we felt it was unnecessary as we do not need to manage user accounts.
Everything is terribly slow. Finder frequently beach balls and takes forever just to list directories. File transfer speeds are slow even for a 100mbps connection and connections frequently drop. Would running OS X Server on the Mac Mini help anything? Do we need to tweak our network settings? We are prepping to update to Yosemite with clean installs with the hopes of starting with a clean slate. Will this help or exacerbate the problem?
Thanks for any help!

Have you tried connecting to the server using AFP?
To protect your existing content, I would suggest the following:
1:  Identify where your existing shared folder is - Let's assume it is /Users/Shared/CurrentShare
2:  Create another folder in the same relative location - For example, /Users/Shared/Test
3:  Share this folder ensuring that AFP is enabled
4:  From a workstation, disconnect from the server
5:  From the same workstation, connect to the server using:
    a:  From the Finder, go to the Go menu
     b:  Choose Connect to Server...
     c:  In the address field enter afp://host.domain.tld of your server or afp://10.0.0.10
-- Obviously replace host.domain.tld with the actual fully qualified host name and/or the IP with the actual IP address of the server.
6:  Once connected via AFP, perform a series of copy tests and time the performance.
All things being equal, assuming you changed nothing else, this test should determine if the issue is the protocol or not.  If AFP is faster than SMB, then you know SMB is crippling you.  If the speed is the same, then you need to look elsewhere.
A Mac mini Server (or not) should be able to achieve about 4 GB/min when performing large file reads or rights over AFP.  This is a good rule of thumb.  If you create a 500 MB DMG file, it should copy in under 7.5 seconds. 
If the performance of AFP is equally as bad, then you might need to investigate your disks.  How full is the drive?  Is there directory damage?  How are the files named?
This should get you started.
Reid
Apple Consultants Network
Author "Yosemite Server – Foundation Services" :: Exclusively available in Apple's iBooks Store
Author "Mavericks Server – Foundation Services" :: Exclusively available in Apple's iBooks Store
Author "Mavericks Server – Control and Collaboration" :: Exclusively available in Apple's iBooks Store

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