Facebook is accessed mostly mobile these days. I remember that they said sth around 70% mobile usage, and that was 1-2 years ago. Many people never use the desktop app (me included).
Facebook pushed mobile first several years ago and were very successful with it.
I still have the apps and account but never use them anymore.
I can report at least a 20% improvement in stress levels.
Facebook is way too overwhelming for me to use. Fortunately the parts that I need to use occasionally (birthdays and messages to acquaintances) can be achieved by spinoff apps (Events and Messenger)
I did the same and saw an 11% improvement in battery life by removing those two apps. I had relatively similar amounts of usage initially, but eventually reduced usage to more scheduled times 1-2x per day due to lack of notifications.
Are we talking about the Facebook desktop website vs. the Android/iOS app? If so:
The Facebook iOS app is snappy on my iPhone 7. Compared to that the Facebook website I access with my MacBook Pro Late 2013 does not feel smooth, and the navigation is terribly broken. Pressing the browser back button often simply does nothing even though the URL in the browser location bar changes. It is frustrating. The iOS app just works.
Facebook pushed mobile first several years ago and were very successful with it.