Rock 3c frequency apparently capped at 1.42 Ghz

[avaf]

Maybe this can help, read carefully and try these tip:

IMX219 + NPU real-time object detection on Zero 3W (experimental)

Drawing TTF text and Rects , i think that is expensive. This is post inference. Not to mention GPU is slow, or run slow. I don’t have any rk3566 to compare to, only rk3568 which is much, much faster. Do you have Zero 3W around to check if my findings below are correct? cat /sys/class/devfreq/fde40000.npu/cur_freq 900000000 cat /sys/class/devfreq/fde60000.gpu/cur_freq 400000000