Google Inbox web app is laggy af in Chrome for me, honestly. I use it for work. I'm on Firefox Nightly and it's super fast everywhere except for the Google Web Apps (which aren't butter smooth on any browser, even Chrome).
That's funny because gmail on Quantum was actually the final straw for me. I was liking what I was seeing trying Quantum out and then I loaded up gmail and boom it worked and looked better than gmail on Chrome and I was sold.