The stick and dongle streaming device variants in particular are astonishingly weak. The current Chromecast 4K dongle for example is handily outgunned by a first gen Apple TV 4K, which this year will be a 7 year old device.
Time to upgrade.
Either the 4K videos of today are "heavier" than the ones from 2017 somehow, or Apple's system updates have slowed down your ATVs to convince you to buy new ones.
But in real terms I moved my home streaming app of choice to infuse. Between that app and the Apple TV 4K I’ve had since just before they moved the remote to usb c it’s been great.
I will say that it is tucked inside a cupboard and hooked up to Ethernet but aside from that it’s leaps and bounds ahead of the other solutions I looked at /tried over the last few years.