I’ve checked the log you shared and your current boot time in each stages are as following.
MB1/MB2: 3s
UEFI: 15s
Kernel: 12s
You can refer to this topic, which is verified on JP5.1.3 but it should be the similar methods for JP6.0GA.
Please note that the boot time optimization is strongly relating to your use case/requirement.
At least, you can start with removing the 5s wait time for UEFI menu.
Aug 06 09:16:44 Jetson System firmware version 36.3.0-gcid-36106755 date 2024-04-25T02:38:25+00:
Aug 06 09:16:44 00
Aug 06 09:16:44 ESC to enter Setup.
Aug 06 09:16:44 F11 to enter Boot Manager Menu.
Aug 06 09:16:44 Enter to continue boot.
Aug 06 09:16:50