My iPhone 8 slowed down significantly after latest update (iOS 11.2.6)

A week after updating my iPhone 8, I'm disappointed to find out that some gesture motions such as swiping and also texting has been extremely lagged and sluggish. A lot of times, characters won't show up for about a half second after I finished composing. Nothing like this has happened before and I'd like to think Apple devices are known to have good processing but this is extremely frustrating, especially when I avoided Androids to not have this problem.

Not sure if it's due to the update, but I'm wondering if Apple or anyone has a solution to the sluggish behavior? Is anyone else experiencing this as well?