It's not slow anymore, it's mostly as heavyweight as it always was, what means it's a lightish application nowadays.

Clunky can mean several things, and I don't think Eclipse changed in any of them since early 00's. If you consider it an specialized IDE (that means you'll download a full one for each kind of development, prepackaged), and disposable (non-upgradable, you'll download the next version and delete the current one), Eclipse is quite ok for many kinds of development (even some you do with Java).