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I'm getting bored with Javascript.

I had a look at Julia and as a result I think that there is some solid value in designing a language whose performance can match C if needed yet use dynamic typing when convenient.

I just don't know what to do next: CoffeeScript or Dart?

Both improve on Javascript. CoffeeScript with a cool syntax. Dart with performance.

How can I have both?

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Since dart will have to compile down to javascript for any browser that isn't chrome* , there probably wont be much, if any, performance improvement that you can depend on. Your only way to be able to use the speed up would be to restrict your client base to chrome only users. With that said, regular old javascript is really a much more interesting language by itself than dart. Perhaps I'm opinionated, but I just don't see anything exciting about Dart.

* This is based on most browser vendors not being supportive of it.

I just spent a couple of hours reading the Dart site.

Dart is a web friendly optimized SmallTalk with a Javascript like syntax.

It looks like Javascript but feels like SmallTalk.

If that marketing trick works, it will be ironic because Scheme inspired Javascript looked like Java for the same marketing reason...

CoffeeScript might be Javascript's swan song.

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