[mark_l_watson]

I am late to this conversation, but I have a question: both my iPad Pro and my iPhone 11 Pro seem to get slightly shorter battery life between charges. Has anyone else noticed this? Perhaps it is because Javascript runs slower?

[varenc]

Have you enabled Lockdown mode on both devices? Then that's almost certainly the cause. Without the JIT you're going to be burning a lot more CPU cycles running JavaScript.