Though YUI 2.7.0 was only added to the matrix on April 10th, the results submitted so far suggest that YUI performs the given tasks with comparable efficiency in the newer browsers, and better than most in Internet Explorer 6, 7, and 8.
Though YUI performs ably, it’s my opinion that the numbers seen in TaskSpeed should be taken with a hefty grain of salt. The tests are designed to exercise library abstraction logic against DOM-intensive operations. The issue here is twofold:
By and large, TaskSpeed may be more of a distraction than a source of information useful to the consumer. My greatest concern is that people will make a decision to choose one library over another based on which one can add a ridiculous number of event subscribers in 25 milliseconds vs. 30, ignoring more important issues like cross-browser stability, code maintainability, documentation quality, and community support.
This is not to say that TaskSpeed is without value. Here are the interesting take-aways I’ve found:
I’d like to personally extend a big “thank you” to Eric Ferraiuolo for having done the fantastic legwork on this. Another great example of the importance of community contributions to the YUI library!