On a Windows domain I recently had to do a "force removal" of a domain controller.
I was careful to remove all the metadata and did a metadata cleanup.
I also removed all references to the domain controller/dns server I removed on the remaining dns server.
I also moved the fsmo roles and global catalog server role to the new domain controller prior to the force removal.
Now dns is extremely slow to resolve internet websites. If I add the google dns server, to the speed is normal.
Is there a way to further troubleshoot the problem?
Have I missed something in removing the old domain controller?