In my personal experience, this is definitely the case. My iPhone 14 Pro Max slowed down a LOT exactly 3 days before the launch of the new iPhone. I thought it

In my personal experience, this is definitely the case. My iPhone 14 Pro Max slowed down a LOT exactly 3 days before the launch of the new iPhone. I thought it was just a coincidence and did upgrade to 15 and it happened again. Someone on reddit a while ago actually graphed Google trends data for "iPhone slow" and found out there were peaks for the search term right around Apple's launches.