iPhone 14 PRO MAX with problems at refresh rate

a week ago I bought a 14 Pro max, but I am very disappointed with it. before it I had a 14 plus but I wanted to upgrade in the hope that the games and applications would run much better, which turned out not to be the case. in games I have a lag every 5 seconds, a lag that I never had on the old phone. this lag is very annoying and makes games run even harder. I understood that it is about Pro Motion and the software update, and that this problem will be fixed in September when ios 17 will be officially released. In conclusion, I would like to say that on the pro max I use the same settings as on the 14 plus, no nothing has changed. I don't know what to do, whether to take it under warranty or wait for an update. what do you say? thank you