This point is moot, again, because you can regulate resolutions literally as a mechanic in Xenforo.
I'm running on a six-year-old ASUS Laptop atm, and I've never had a problem running web pages with that much embedded media on a Xenforo forums site. It's either I haven't, or I did but it was so trivial that I couldn't notice. In either case this seems futile, so I'm going to leave it to whoever needs to evaluate this. It's not urgent enough that it requires me battling to defend it.