HT200234 Speed up user log in to Mac Server Pro

I have a mac server pro and 31 imacs. When several users log in at the same time, it some take up to 3 minutes to logi n to the server.How can I speed up user login time?

It sounds like your using network home directories. With this setup all the users files are stored on the server, this means when they login a lot of files have to be sent over the network, it is particularly bad if your using Apple Mail which then has to open and check many email messages - each of which is another file to be transferred.
Therefore there are two aspects that affect speed, the first is the network connection speed, you want your server to be on at least a 1Gbps Ethernet connection, if you then have say three computers using it at the same time, and these computers also have 1Gbps Ethernet connections they would actually get an affective 333Mbps speed i.e. a third each. If your server only has a 100Mbps connection then the users would get a third of that i.e. 33Mbps. It is possible to in theory join together multiple 1Gbps links to make a 2 or 4 or even 8Gbps connection this requires a suitable network switch that supports 802.3ad aka. LACP.
As you can probably already see, if you had ten computers connecting to the server at the same time then the speed each effectively sees is even slower.
The other speed constraint is typically the storage being used by the server, if this is hard disks then using a high-end RAID system or even SSD flash memory storage also in a high-end RAID solution would speed things up. In the PC world it is common these days to have one very highly specified server with equally highly specified (and expensive) storage, in the Mac world were we have no 'real' servers any more people have been trying to get away with what is effectively an ordinary desktop computer and as you are finding it is not really up to the job.
Note: With a high-end RAID system you would also need to use an interface other than USB or FireWire both of which in such situations are actually considered 'slow'. We are talking here about FDDI at 8 or even 16Gbps compared to FireWire at 800Mbps.
Sadly there is also some truth to the fact that OS X is far more greedy for network bandwidth than Windows, not only will you see the problem you have, but it is even worse even for a single user when they remotely try and access a file server
The somewhat good news is that once the users are logged in and the initial traffic has subsided then things do generally settle down and feel ok, the problem is the initial hit as everyone starts up, this has been problem in particular for schools with classrooms of computers all starting at the same time.

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