Is a .osm file of size 668.7 MB too big for the following operations?

Sorry that I did not explain it clearly. I’m referring to the routing ideas, not mainly pictures. Thank you so much for your help along the way, I really really appreciate that indeed.

Sorry, I misunderstood your question.
The road map representation in OpenStreetMapX is already using very similar nechanism to the one described in the link that you have sent.You might want to have a look at the source code.

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I think OSMnx is a great open source reference for this kind of thing, very feature complete but sometimes slow due to the NetworkX backend. They recently added igraph as backend as a workaround. It would be interesting to compare the speed-ups that julia may offer here.

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@IlyaOrson, yes, I checked this OSMnx package earlier. It is written in python. It takes a bit time to dig deep of the code, and it would be wonderful if I can grasp the ideas / thoughts under the hood quickly. But I guess I need to work on the source code anyway. If you have suggestions, feel free to let me know