But then he will spend a huge amount of time replicating functionality that browsers provide, functionality which is hard to implement and hard to maintain. Als

But then he will spend a huge amount of time replicating functionality that browsers provide, functionality which is hard to implement and hard to maintain. Also will loose advantage of being easy to extend. But on what kind of computer did you test this? On my windows desktop it is as fast as sublime. On mac scrolling isn't smooth, but from chrome timeline i see that it is choppy because it doesn't handle scroll events correctly, not because of performance.