I don't find slack to be particularly well executed. It's often obvious that I'm dealing with a (poorly executed, laggy) html UI. It's segfaulted in JavaScript

I don't find slack to be particularly well executed. It's often obvious that I'm dealing with a (poorly executed, laggy) html UI. It's segfaulted in JavaScriptCore on my machine. So apparently they've managed to combine the performance of HTML with all the security of C++. Their success seems to be mostly a matter of not being as enterprisey as hipchat and being less geeky than IRC.