Meta Quest Browser & BabylonJS = Slow FPS

I'm trying learn about WebXR and I'm finding that my library of choice isn't playing well in the Meta Browswer, locking at about 30 FPS.  Now, I see 60 FPS on the desktop with Chrome and I know that's because Chrome is locked in a vsync.  I can pass Chrome some parameters to unlock the FPS limiting.  At that point, I'm seeing around 500 fps.  Chrome works great with Link, but I'm looking to work with the native Meta Browser inside the Quest.

I've found other engines, such as the Wonderland Engine, demonstrates 72 FPS in the Quest with their app Escape Artists (https://esc.art).  A-Frame applications show up in the browser at 90 FPS.

So my question is, is there some sort of parameter or command the WebGL lib should be passing to the browser to speed it up?  Or, is this likely to be some sort of bug in BabylonJS that is locking it to 30 FPS and the browser doesn't have any sort of artificial rate limiting?