Reviewable founder here.  Yep, Reviewable is a heavy client-side app, and I make no apologies for it.  Mobile devices are getting powerful very quickly (you can already use Reviewable pretty much fine on modern phones&#x2F;tablets) and the target audience of developers generally needs reasonably powerful devices anyway.  I&#x27;d rather miss out on some users in the short term than lock myself into an obsolete server-centric architecture in the long term...<p>That said, performance is <i>always</i> an issue, it&#x27;s just a question of where to set the target.