The specs can say all kinds of outrageous ad-copy stuff about the features of the TV. You’ll need to validate that. If you want to use a normal TV you’ll want to disable all automatic “image enhancers” before calibrating and some TVs won’t let you disable everything.
For all intents and purposes optimized media is proxy media in Resolve as you can create optimized media in a lower resolution than the original for better playback. In addition Resolve has a proxy mode that drops the timeline resolution for better performance kinda like Premiere can do for its viewers. Aaaaaaaaand there’s also a performance mode that tries to tweak some other settings under the hood for performance gains.
By default the optimized media is uncompressed 10 bit and that will require pretty fast storage media to run in realtime, especially in 4K. If it’s 60 fps then it’ll require around 5 GB/s of read speeds.