The refresh rate of the phone is designed to provide a smoother experience, however, it can cause lags in certain usage scenarios. This is because at a 90Hz refresh rate, some APPs can require more computing resources, while the phone's performance can not be enough to meet the requirements, resulting in lags.
It is recommended that you try switching the refresh rate to 60Hz, because in this case, the phone will refresh the screen at a lower speed, reducing resource pressure and thus alleviating lag issues. This ensures better performance and use experience in different usage scenarios.