DHCP switch DELL problem

Hello,

We have recently put some DELL  switches,
users who are connected in those DELL complain that
when they turn on the computers it takes several seconds
to have ips. I have simulated the same configuration in the
office and it is true (it takes more than normal, more than 1 minute),
when I connect a computer to another switch of another brand I have ip at 10 seconds or so.

The configurations are nothing special, only DHCP snooping enabled and DHCP snooping trust,
any idea what it can be?