I have a 150 node network that was broken up in to 4 VLANS. 1 for servers, 1 for each wing of the building and one for phones. when I copy a large file from the server to a workstation in the server vlan it is fast. if I copy that same file from the server to a workstation in one of the other vlans it is 10 times slower. Any idea why.
Something's doing your routing, it's that you need to look at, it's either underpowered or your segments are too busy. Given you've told us very little that's all I can say without some actual details.