Hi,
I’m facing the exact same problem. It seems that it is using depthwise convolution with dilation that can make quantization much slower. Using normal convolution + dilation is fine.
I tested on a single convolution block with in_channel, out_channel = 96, kernel size = 5 and dilation = 5.
Convolution block before quantization: takes ~358ms;
Convolution block after quantization: takes ~64ms;
Depthwise separable convolution block before quantization: takes ~154ms;
Depthwise separable convolution block before quantization: takes ~447ms;