My PowerBook G4 might be a bit dated, but running other resolutions than native is quite heavy on that thing. Your built-in display can handle one resolution only - anything else will require upscaling.
Your GPU can probably do that upscaling for cheap. But cheaper than rendering your desktop applications? 🤷♂️
You’ll have to benchmark your particular device with powertop.
IPv6 was “just around the corner” when I was studying 20+ years ago. I kept a tunnel up until the brokers shut down.
I’ve been hosting some big (partly proprietary) services for work, and we’ve been IPv6 compatible for a decade.
My ISP finally gave me native IPv6 earlier this year, which gave me the push to make sure my personal hosting does IPv6 as well. Seems like most big players services support it today. It’s nice to not have the overhead that CGNAT brings.
IPv6 got a bit of a bad reputation when operating systems defaulted to 6to4 translation but never actually managed to work.
For an external display I’d bet the case is the hardware driver for the panel.
At least my 17" Powerbook G4 with a massive 2560x1440 display does it in the software display driver. I’m sure some laptop panels do it in hardware as well, but seems there’s some very janky shit going on at least with laptops that have both integrated and discrete GPUs.