Taking over 8 minutes and counting to import a 1.6GB onnx model

Sure, I have put it in my Dropbox and I will send you the link to the onnx file in a message.
(It was this unet model outputted as a float16 onnx file.)

I believe there may be an issue with memory leakage in general when importing onnx files, but this one in particular seemed to take a particularly long time.

(BTW my system has 12GB RAM)