PCs on IP range very slow login
We moved from CC3 to Vanilla over the summer and an external company (i wont mention names) setup AD, DHCP and DNS and I did the rest. We run Ip addresses over x.x.44.x and x.x.45.x. Whilst using Spiceworks I noticed x.x.45.x PCs weren't scanning, so after checking everything else I thought I would check DNS. DNS forward lookup zones all fine, checked the reverse lookup zones and I noticed that only the x.x.44 range folder was in there, so I created the x.x.45 range folder and bipadebopadeeboop the ip addresses suddenly appeared and rescanning Spiceworks all PCs are scanned fine.
But I am still noticing that the PCs with x.x.45.x ip addresses are still logging on very slowly compared to the PCs on the other IP range. Is there something else I need to do to DNS for this range?
Any help would be greatly appreciated.