Serious problem of ksampler on mac with SD3.5 turbo

[Creative-comfyUI]

We are not able to render successive images without the ksampler slow down or blocked. I am not sure where the problem comes from, but the way to solve the problem is to quit the browser and start from the beginning. The sampler we choose seems to have an impact on the problem. This is what we can see. At that time the green bar is at the half of the ksampler .

got prompt
Requested to load SD3
Loading 1 new model
loaded completely 0.0 15366.797485351562 True
6it [19:29, 195.05s/it]

The ksampler seems stack.

The second problem it can stack at 0%
loaded completely 0.0 15366.797485351562 True
python3(13541) MallocStackLogging: can't turn off malloc stack logging because it was not enabled.
0%|