iPhone 15 does not feel smooth when scrolling on some apps

Hey guys.

I've always been an Android user, this is my first iPhone and i had very high expectations since its the latest iPhone. Before you say it, yes, im running the latest iOS version as of 17/02/24, yes i check each apps' updates and still, sometimes instagram feels laggish, like when scrolling i was expecting it to be smooth, Facebook or X (twitter) are even worse, i have plenty of storage since the phone is only 1 month old.

When i scrool on Facebook or X, its like if the last frame stutters and it's so annoying. Also on WhatsApp, the app feel smooth except when it comes to scrolling inside a conversation.

So the question is, is this normal on iPhones or is it just mine?.