Slightly of topic: I’ve been using lockdown mode on mobile for nearly a month. I’ve not done a side by side comparison to verify some of these aren’t just broken websites, but so far I’ve noticed:
Missing icons (reduced font support)
An article endlessly repeating the last couple sections on one of the tech [sites]
Navigation menus not going where they should
Text moving around on me when scrolling
The first is the only one [I’m] certain is a lockdown artifact. The last two I see sometimes because websites are broken, but I’ve noticed it more lately.
None felt like performance being slow. None convinced me to disable lockdown.