Komodo IDE 10.2.0 build 89833
macOS Sierra 10.12.3, MacBook Pro - Mid 2015, 16GB RAM
It's certainly not "snappy". It can use 80-90+% CPU even when I'm not actively using it, but sometimes it's fine.
With about 5 projects open (and maybe 2 dozen files total) the Komodo process is using ~1.4-1.8GB (It seems to vary even when I'm not interacting with it).
But since 10.2, occasionally - perhaps once a day or two it will try to use 15-30GB of memory (according to activity monitor) and of course the whole computer becomes unusable, but then returns to normal in about 5-10mins or so.