Both the reload code and the become are already annotated with timeline blocks. We can revise the current timeline blocks over time).

• Establish baseline times for reloading dart2js while compiling X
• Figure out what X is (probably something smallish so that the dart2js run doesn't take too long)
• Make debug and release reload as quickly as possible

How to run dart2js:

In your top level sdk/ run the following once:

$ ln -s sdk/lib/ lib

In pkg/compiler run the following:
$ gdb --args ../../out/ReleaseX64/dart --timeline-dir=. --reload-every=500000 bin/dart2js.dart --categories=all path/to/entry.dart