Ok, here is what I found to get around :
In whatever repo you know have conflicts, you can use right click->Tortoise SVN->Resolved.
This will list all conflicts in the repo, taken recursively all subfolders too.
Find a target that is big enough for you, and resolve your conflicts till the list is empty. You can even resolve them directly within the window is you wanna go faster.
Group resolve also works for elements in the same folder that have the same kind of conflict.
Hope this helps someone :)