If you go to gmail.com from your iPhone’s safari web browser and you will notice two improvements, rolled out by Google in the past few weeks.
First, scrolling is snappier: the speed of scrolling reflects the speed of your swipe gesture. This is helpful for long conversations where a few quick flicks will get you to the information you need much faster than before.
Second, the toolbar stay on screen while you’re scrolling rather than moving down into view after each scroll. Being able to access your toolbas from any point on the page should make it easier to triage your email and move around the app.