I'm not thrilled about the large chunk of advertising at the top of that addon's page. It's for another one of the author's addons, but still... it's pretty annoying. I'd probably opt for an addon whose author was more interested in publishing quality code than in boosting their download numbers.
ResourceTools is more aimed at developers, rather than casually curious users, and will provide more detailed information. It hasn't been updated since 2009, but it worked fine as of the last time I used it (maybe 6 months ago), and I don't think anything in the relevant API has changed since then, so it should still be fine.
Alternatively, you could post a list of your addons, and we can quickly point out which ones are going to be the most resource-intensive. You can
use this script to quickly get a text listing of your addons.