Sorry for the trouble you were caused. All mobile phones undergo strict professional inspection before leaving the factory, so you can use them with confidence.
You can go to [Settings] >> [Home screen] >> [Animation speed] and select [Fast] to change the animation speed.
When the phone runs multiple background processes, it can slow down the overall performance. Closing unnecessary apps or restarting the phone can help improve speed.
If your device has a lot of apps or data consuming memory, it will cause slower transitions. Try clearing up some space by removing unused apps or files to improve performance.
Please update your phone to the latest OTA version.