This issue is a copy from eclipse marketplace: https://marketplace.eclipse.org/comment/7564#comment-7564

I have installed the asciidoctor plugin on a second machine. Before I did I installed the GraphViz stuff and tested it and its working (you see - I learned my lesson with this plugin).

But now I have another most annoying effect:

If I create a testfile containing just

@startuml
testdot
@enduml

and save it then the plugin kicks in and a few seconds later I get an "image" that reads:

PlantUML verson 1.2021.2 (Sun Mar 07 12:10:27 CET 2021)
Dot version: dot - graphviz version 2.47.1 (20210417.1919)
Installation seems OK. File generation OK

So, the config seems to be working.

However, as soon as I save a file that contains more than just 2-3 components or classes then the image generation always hangs "forever" (i.e. a minute or so) and all I ever get is a message like:

Preview file generation timed out, so preview not available at: 
C:\Users\mmo\AppData\Local\Temp\asciidoctor-editor-temp\project_example_app-174616751\-1369575984_internal_mainclasses.html

My Laptop is pretty fast (i7 CPU (10th gen), 16GB RAM, 1TB SSD, etc.) so I doubt that a simple picture with maybe 10 rectangles can really be taking so long that the graph generation times out.
Any idea what could cause this?

This is on eclipse 2021-03.