Sony a7m4 with God Bull Flash shutter is slow.

1, shutter problem. If the shutter is broken, it is recommended to send it to after-sales maintenance.

Repair.

2, insufficient light, shooting in an inaccessible environment, the shutter's response is different. If there is enough light outside, the shutter will respond in a short time when shooting. Because there is too much light, the shutter must be closed in a short time, otherwise the photo will be overexposed. But if the light is insufficient (mostly indoors), the shutter will open and close slowly. Because of the lack of light, in order to let more light gather into the camera, the shutter should be closed slowly, so the shutter response is slow.