nope ,
my iphone X got super laggy(it was smooth when i got it but Suddenly for some reason it became really Laggy ) and it's funny, these lags started the same day that 11.3 was released so i updated and everything is super smooth no lags not a single one
and even my 6S plus(maybe older than 2.5 yearsold) is running Totally smooth,maybe as well as my x