I attended the Red Dot Ruby Conference this year at NUS University Cultural Centre last Friday and Saturday. It was a two days event and attracted approximately 200 programmers around the world.
Llya Grigorik from google gave a very interesting talk on how to build a faster web using various technics. If you are experiencing slow website problem, you may want to check out his slides at Building a Faster Web.
There are also a lot of interesting topics that were discussed during the conference e.g PUBSUB infrastructure, Client Slide Templating, Using Redis to improve site performance, CoffeeScript etc.