Improve performance of "visualize" graph operator

[thomaskrause]

No description provided.

[github-actions]

Commit 6b45710

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Diff Coverage
Diff: origin/main...HEAD, staged and unstaged changes
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src/manipulator/visualize.rs (89.5%): Missing lines 170,410,417,423,425-426
src/progress.rs (100%)
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Total:   66 lines
Missing: 6 lines
Coverage: 90%
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