What about the common "Grid"? When you have a table with 100-1000+ rows and 5-10+ columns and then you want to resize columns, or bind click functions to them, or enable drag and drop or have collapsable rows, or sorting.
This is where selector speed should make a difference. The 1.0 version of Slocums grid should be a perfect real world test. Put 1000 rows in it. Then use it with a jQuery base, and then a DomQuery base. Does the user see a differece then? Other than that, what are real world examples where it would matter? Glen