Jetson TX2 and Nano CSI Camera Latency

Hello All,
I run the following gstreamer pipeline on hardware Jetson TX2 and Nano,

gst-launch-1.0 nvarguscamerasrc ! 'video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1' ! omxh264enc bitrate=14000000 ! 'video/x-h264, stream-format=(string)byte-stream' ! rtph264pay ! udpsink host=10.42.0.158 port=5000 sync=false

The End To End delay in Jetson TX2,OV5693(Cam) is about 170 milliseconds
But
The End To End delay in Jetson Nano,IMX219 is about 130 milliseconds

All other test components are the same!!!
what is your opinion on this topic??
I expected the TX2 delay to be less or at least equal to each other ??
really why??

Plesae add maxperf=true to try.

gst-launch-1.0 nvarguscamerasrc maxperf=true ! ‘video/x-raw(memory:NVMM), width=(int)1920, height=(int)1080, format=(string)NV12, framerate=(fraction)30/1’ ! omxh264enc bitrate=14000000 ! ‘video/x-h264, stream-format=(string)byte-stream’ ! rtph264pay ! udpsink host=10.42.0.158 port=5000 sync=false