With Client in Station pseudobridge mode, dhcp slow

Hi all,

I have an MT Client in station pseudobridge mode. Anyone connected to that client on the ethernet side gets an IP address from the DHCP Sever that is upstream. It is very slow to get an ip address. On a windows computer, it will error out with dhcp server unavailable and after 10 seconds or so, will get and address and work just fine. If I replace the Mikrotik with a ubiqiti bridge, dhcp works fine. Anyone know what this might be? or how to fix it?

Thanks for your help
Mark Spencer