To me the issue is that you have a smartphone that runs a virtual machine instead of native software. What you describe is what I have hated from Java the last

To me the issue is that you have a smartphone that runs a virtual machine instead of native software. What you describe is what I have hated from Java the last 10 years. Mozilla would be more of the same right now, as Javascript is also not native. My best bet is Ubuntu Phone, whenever it's ready.