Smart TVs from at least the last 5 years have a similar problem. You update the software and they become excruciatingly slow, or you can't update the software and they gradually become useless.
True, my old LG TV UI kept getting slower and slower with each update, finally I stopped applying updates and switched to a Roku.
Though the good thing is that I can't see the carcass of the old SmartTV laying around, the TV stays connected to the Roku so unless I accidentally hit the Channel up/down button and switch it to TV mode, I never see the LG SmartTV features.
I hit that point with my 5 year old Sony android TV. I just plugged in an Nvidia Shield TV device, though, and now it's buttery smooth again with nearly perfect integration.
Damned if you do, damned if you don't.
But I can replace an old Roku for $39.