Android 7 on a Pixel device, and just browsing with Chrome will cause it to completely freeze (no panning, can't focus the URL, can't open task switcher) for seconds when first landing on a heavy page. This has been a problem since day one and with every single Android device I've ever used, as there's still a whole bunch of stuff on the main UI thread as any developer on Android will intimately know, and it absolutely will freeze when under a load. It's just fundamentally architected wrong, since you can block the UI thread it does block.