VisualVM Retaining sizes is stuck at 33%

Describe the bug
I have a 6GB heap dump that I want to analyze. Basically find out where a lot of the sources of Memory Leaks come from.
When starting the determine the Dominators.
It goes through 3 progress bars.
At the third one (Computing Retained Sizes) it gets stuck instantly on 33% when GC Sizes are computed.
And while it seems to continue to work (after allocating 16GB on startup) it seems to barely use any resources.
It uses 7% of my Entire CPU to do its work.

Is this normal?
The progress bar "while improved" is basically still useless.
(I remember a time where there was no % at all)

To Reproduce
Steps to reproduce the behavior:
Start Visual VM take any Heap Dump thats like 6-10GB large and try to determine the Dominators.

Expected behavior
I guess be faster? And also progress communicated?
Like "1000/432312 Files processed"
Also maybe "performance options" that could be set to utilize system hardware a lot more?

VisualVM log
Even ran through the command line there is 0 logs besides: "Program found another console was used so it will be using the console provided"
logfile.txt