如何防止没有更改的subversion更新导致IIS重新编译网站？

For my staging site I have a subversion repository that I update when I need to view the changes on the staging server. Instead of manually updating the staging server subversion folder every few minutes when I need to check something, I've got a script that automatically checks for any subversion updates. My problem is that each time an update is checked for, even if there aren't any changes, I think subversion might be changing some of the files in the .svn folders on the site and it's causing IIS to recompile the website which takes about 40 seconds. If there aren't any code file changes, I don't want IIS to recompile the website. Does anyone know a good way to fix this so that the site only gets recompiles on code changes and not after every update check?For my staging site I have a subversion reposit