After setup DHCP servers in the network you may discover problem with a slow response from DHCP server. This is very common problem when the network use a segmentation. Usually each of VLAN required own DHCP server. To correct this problem you should enable dhcp-server authoritative:
configure set service dhcp-server shared-network-name Server-Name-1 authoritative enable set service dhcp-server shared-network-name Server-Name-2 authoritative enable set service dhcp-server shared-network-name Server-Name-n authoritative enable commit save exit
Also when throughput between VLAN’s isn’t pretty high you should enable offload ipv4 option.
configure set system offload ipv4 vlan enable commit save exit