Lag, overheating, and frequent crashes on iPhone 11 (iOS 18.6) with Minecraft 1.21.94

After updating my iPhone 11 to iOS 18.6, I encountered several performance issues when playing Minecraft version 1.21.94. The game frequently stutters, slows down, and the character controls often freeze. In addition, the device becomes noticeably hot, and the game eventually force quits.