PUN onPhotonSerializeView lag between bigger and bigger

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I'm using Photon standalone server and Unity to make multi-player game in Unity. However, I get trouble with photon onPhotonSerializeView, my code is:



I want to get lag of synchronization. At the beginning, lag can be small, such as 100ms, but when the player keeps moving on one device, the lag will be bigger and bigger, and the dummy player on another device move like delay. After some time, the lag can be 20s or more.
My Unity Photon inspector is as follows:



File *playerMovement.cs* contains `OnPhotonSerializeView` code.
Can anyone help me?

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