We are trying to test the performances of CouchDB by measuring the times it takes to execute a query (=a view) in different conditions.
We used a modified version of the default test suite - I'm not posting it now cause the code isn't very readable, but if you need it, just ask and I'll fix it up.
In this version we put some functions to create a named view and execute it with a single argument; then we ran the test suite from the Futon utility, we collected execution times from the test suite and put them into a google document.
Results show more shadows than lights: the database is fast when executing queries already indexed, but it's really slow into creating indexes.
We are working to expand this test with different sample-data size. So keep in touch!