Hi Sean,
Some of my projects are over 100 MB :-)
The directory diff compares the files by default looking at their timestamps and sizes so large files will be processed as easy as small files. Unless you have a huge number of files the directory diff should work in a reasonable time. (For content comparison you can either use the binary diff action or set in options to perform content comparison instead of looking at timestamps.) Also, note that if you add both folders in the project as linked folders then you can select both in the oXygen project panel and use the Compare actions to compare them. The same can be done for files, the contextual menu Compare action from the project panel will use the selecction as input. Best Regards, George -- George Cristian Bina http://www.oxygenxml.com