The image quality of the simulated city on the mobile phone is too bad.

I found a problem that has been bothering me for a long time is that the image quality of the simulated city on the mobile phone is really too bad. Many scenery can't be shown, as well as those skyscrapers and epic buildings. What should I do?

It's similar to the hot air balloon below. Sometimes it even disappears directly, and there is no one in it.