Previously all fixtures were bundled in a single chunk. We can use dynamic import() instead to split the the file up into multiple chunks. This has only minor implications during development since the browser no longer has to evaluate 14MB of JavaScript on landing (initial chunk is down to 3MB).

It's mainly done now to enable lazyCompilation once it's stable. Lazily compiling the demos will be the major booster since we could basically have a very fast cold start and then compile the next demos while running the test i.e. compilation and test will be concurrent.