DNS slow

I have enabled the dns server on routeros v6.0rc14 pointing to 8.8.8.8. The lookups are super slow timing out most of the time. Local static lookups are fast. If I remove the dns setting and just assign the dns server via dhcp scope all is fine.

Known issue? just my luck? could not find anything via google.

Check cache if it is not growing rapidly and if there are not requests from wan.