If you load it off of the TodoMVC site, it loads much faster than the AngularJS version. If you load it from GitHub then it is slow because that isn't a packaged/built version (it's just loading directly from the repository) and is loading all of the individual models separately. We have a 'BuildApp' tool which can package applications for production, which doesn't happen when you load directly from GitHub.

FOAM doesn't require a build step, which is why it can be run directly out of the Git repository, but that method isn't representative of production performance.