Web versions are designed to run badly. They want you to use their app because they can track you and spam you with ads. Why would they make it easier to use a web browser with an ad blocker?
LinkedIn is a good example. It's barely usable in a browser, and uses a huge amount of resources, on a mobile or desktop device. In the app it runs better but you can't turn off the annoying video posts.
Then again, YouTube runs fine and has no ads.
A lot of apps are just front ends to web pages anyway.