Lingering issue 3x USB camera at 60fps 1280x720

There are known constraints:

PCIe throughput of Jetpack 5
Bad Jetpack5 nvme writing performance compared with Jetpack4 - #4 by DaneLLL

Embedded eMMC in AGX Orin module:
Disk write performance issue on Jetson AGX Orin - #10 by DaneLLL

So it is possible IO speed is worse when comparing to other Jetson platforms. Would suggest compress to H264 or H265.