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Hmm, this looks interesting. It should eventually send it even if it’s slow. Can you share the source file so we can replicate this issue on our end? You can send a PM if you don’t want to share it publicly.
I just tried creating a blank file with the default C3D template (dwt) and put a test alignment in, and it sent instantly.
This led me to look into my drawing settings. I can get it to work if I change the drawing units from US Survey Feet to International Feet. Once I change it back to US Survey Feet, I can no longer send to the stream.
Is this a known issue with US Survey Feet? I must use that unit on my projects, so maybe I can do a transformation of the data before trying to use speckle. but for many linear civil infrastructure projects, US Survey Feet is the required unit of measure and it would be great if Speckle supported its use.