I recently did a simple performance test on both Spring container and Yan container. Primarily to make sure Yan is not sacrificing too much performance for flexibility and can relatively stay on the same level with Spring as far as performance is concerned.

The test is on bean construction time only. Bootstrap time is not covered. Neither are advanced uses of both container.

The test result shows that Spring singleton beans are probably fast enough, while prototype beans are surprisingly slower.

http://docs.codehaus.org/display/YAN/Performance+Test+%28Nuts+vs+Spring%29