I mentioned some weird things regarding to the filesystem.
This is real under the hood stuff for the developers.
I guess (assumption) they are using OS hooks to see if a file is created/changes/whatever and that sometimes the handling doesn’t go as smooth as we want it to be.
Other assumption would be somewhere in the caching mechanism.
I noticed for Graphs it takes a while to have the Graph fully finished although the files are already created a few seconds before (see also my showcase on 800K+ node test)