The animation that you are referring to is called a "page transition" animation, and it is a built-in feature of most mobile operating systems. While it provides a nice visual effect to the user, it can also slow down the page loading process, especially on older or slower devices.

To disable the page transition animation, you can try the following steps:

For iOS:

1. Open the "Settings" app on your iPhone or iPad.
2. Tap "General", then "Accessibility".
3. Scroll down to the "Reduce Motion" option and turn it on.

For Android:

1. Go to "Settings" on your Android device.
2. Scroll down and tap "Developer options".
3. Look for "Window animation scale", "Transition animation scale", and "Animator duration scale". Set each of these to "Animation off" or "Animation scale 0.5x".

Note that these steps may vary depending on your specific device and operating system version. Disabling the page transition animation may improve the perceived speed of your app, but it's important to remember that it may also affect the user experience. I used it in one of the tracking site. You may want to consider other ways to optimize your app's performance, such as reducing the size of images or optimizing the code.