Now, if you claim: "every app lags like heck" would be true, even remotely true, then this and all other related forums would be filled with postings about such a problem. But that is not the case, not at all. So, possibly you are only using network dependent apps AND your network service is the worst on the earth or, you are just bashing.
The Nokia 6 is pretty fast and capable phone. I have 4g service and I'm using the phone a lot, both networked and non-networked apps, I've never experienced any unnatural lagging. For example, I'm always amazed how rapidly the phone maps a 2TB USB HDD that is full of movies and how fast the directories are available for browsing and copying with a file manager app, it happens in a few seconds, far faster than my 4000 USD laptop does the same.
Happening to me as well.
disappointing but I have swapped my phone for a Huawei P10 Lite... runs much smoother
yes, the same here with the FB app...