If you open the Rendering > Frame Rendering Stats in the chrome dev tools, it seems to indicate 30 fps. Switching to a different tab and then back seems to fix the issue.
Measuring this with screen recordings, the recordings seem to confirm that things are always running at 60 FPS. Perhaps there's just something about these SVGAs that is hard for Chrome's stats popup to measure?
It seems like Chrome is running SVGAs at 30 FPS.
If you open the Rendering > Frame Rendering Stats in the chrome dev tools, it seems to indicate 30 fps. Switching to a different tab and then back seems to fix the issue.
Not sure what to make of this.