Adding reacts, whole bunch of new settings, fb history, messenger... It's bound to be extremely laggy. All the time, it takes at least 5 seconds to click on an image
There are ways to combat this especially on the phone.
I use Messenger Lite, which is a barebones version of the full blown Messenger app. Doesn't include all that junk such as Rooms etc. and is only a few MB in size. Works the exact same in terms of notifications etc.
Look up Messenger Lite in the App Store. Should be thereAlso a Lite version of Facebook for Android:
https://www.facebook.com/lite/ (although I think this is for certain devices only)
I do agree though - especially on the PC. I view a page and always get a warning that scripts are slowing my pages down. Says alot really
Speaking of facebook - i've always found it interesting that you can change the settings in regards to friend requests (e.g. who can friend request you and who can't), but there is no similar option for Messaging. Like.. personally, I don't want random people messaging me.. so i'd love an option to get rid of the message button altogether from my timeline from those who aren't my "friends"