Increase Frame Rate External_trigger Mode AR0314 with Pi4

1.Which seller did you purchase the product(s) from?

2.The Model number of the product(s) you have purchased?

3.Which Platform are you using the product(s) on?

4.Which instruction are you following?

5.Has your product ever worked properly?

6.What problems are you experiencing?
I want take more image per second with external_trigger mode

I’m use ArduCam Shield USB2.0 RevD AR0314 , Pi4 , and example code ArduCam_Ext_Trigger_Demo.cpp but i just have max is 10fps.

My external_trigger: i use arduino with code :

digitalWrite(trigger, HIGH);

delayMicroseconds(400); // 400 microseconds.

digitalWrite(trigger, LOW);

delay(30); //30 milliseconds.

In mode streaming i have 30fps.

How can i take more fps with external_trigger mode?

7.What attempts at troubleshooting have you already made?

8.How would you like us to help you?