Different Phaser performance with the same code

Im making game and im struggling with a game performance on mobile devices.
I have noticed that even on a Phaser example website there are strange behavior.
When I’ll visit this website on my iPhone X:

Then I see alot of fps drop. Its not fluid at all.
When I’ll press Edit>Launch and we will be redirected to:
Then its going 60 fps! So strange, because its the same code.

I think the difference you’re seeing there is because Safari throttles the frame rate in iframes.