Hi Niall and sdavis1,
First off, I see you both are new to Toad World: welcome both of you to the Toad World forums!
Toad for Oracle's Team Coding actually calls the svn command-line client in order to execute the individual tasks used within Team Coding. One thing you can do to try to identify why something may be taking a while is to enable "VCS debug logging" and/or "Log VCS commands in the output window" by going to "Team Coding -> Configuration -> User Settings" from the main Toad menu. You can then view the log either by looking in the output window or by clicking on the "Open log file" button on that same configuration page.
This kind of situation can be caused by a number of different things: latency between the client and SVN server, elevation privileges in Windows, time it takes to launch the svn client in a new command process, etc. To help troubleshoot the issue, if you'd like, feel free to enable those options and capture the log. Then feel free to open up a support ticket, or feel free to e-mail me directly. I'll send each of you a private message so that you can easily respond to me directly and we can attempt to track down and identify the performance issues you're experiencing.