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We have a branch office in another counter, which is connected with a site-to-site VPN to our main office. The branch office does not have a local domain controller / DNS server, never the less the workstations are domain members and query the DNS server in the main office which causes a delay in name resolution while browsing the web.

Which options do i have to get rid of this delay ?

It's not possible to have a local server, but it is possible to get a online DNS service like amazon for example.

Chancho
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You say it is not possible to host a server due to little space and no air conditioning.

A domain controller does close to nothing and does not need to be highly performant. If your computers don't need A/C a read-only domain controller with DNS (which I highly recommend) won't need one. And you can install that thing on a little box and now you have DNS resolution as well as site-local authentication.

Edit: You can install the DNS role without having the a ADDS/RODC role installed and you will be able to achieve your goal. However, ADDS/RODC would be only a small step to another improvement.

Daniel
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  • Why would you recommend a read-only domain controller instead of a secondary one ? – Chancho Mar 04 '16 at 15:48
  • [Advantages That an RODC Can Provide to an Existing Deployment](https://technet.microsoft.com/en-us/library/cc770320%28v=ws.10%29.aspx). But that might not apply to you. I just assumed based on the information that the branch office is rather small, has no it staff, a poor WAN link and no lockable server room. – Daniel Mar 04 '16 at 16:03
  • Edited the answer. You can also just install DNS on the server. But very well also install A DC/RODC if you already deploy a server. – Daniel Mar 04 '16 at 16:09