I’ve noticed that when I have a fixed background, my site scrolls very slow on Chrome. To see what I mean, take a look at my site (http://squareonecontracting.webflow.io/) and compare in Chrome and Safari. I don’t seem to experience that lag in Safari.
Are you on an older Macbook Pro 15" model? I’ve experienced the same thing. On every other device/browser though I don’t have any issues. Even on windows Chrome it scrolls beautifully. Glad to hear I’m not the only one that’s had that happen.