How can clipping performance be optimized?

[guoaobao]

There is a character model, and I want to observe the details of the head when it is running, but when the camera is pulled halfway, the whole model disappears.
The acquisition method is to set mSettings.view.guardBand.enabled = true, and in the renderJob() function of renderer.cpp,
Will float guardBand = guardBandOptions.enabled ? 128.0f : 0.0f; the default is 16.0f, it can be modified to 512.0f,
But so far a new problem has been introduced, that is, the cpu performance consumption is too high, and the cpu consumption on android is directly increased. There is an object model, and I want to observe the details of the head when it is running, but when the camera is pulled halfway, the whole model is gone. disappeared,
The acquisition method is to set mSettings.view.guardBand.enabled = true, and in the renderJob() function of renderer.cpp,
Will float guardBand = guardBandOptions.enabled ? 128.0f : 0.0f; the default is 16.0f, it can be modified to 512.0f,
But so far, a new problem has been introduced, that is, the CPU performance consumption is too large, and the CPU consumption on Android is directly increased by 50%, and there is no way to optimize this performance.