Hi

I think there are two different points :

1 - The layout algorithms should be improved to reduce their complexity. ( maybe I should implement a "true" force based, I mean that I translated the D3 algorithm, but thinking of it now, maybe it would have been better to take a real algorithm from a paper and to implement it from scratch ).

2 - Even if I'm not playing with the mouse, when the visualization is the active window then the computer turns. My CPU runs mad when the visualization is active in Pharo, and that must not be. There is no reason for your computer to turn if the visualization is already drawn and you don't do anything on it.

That is two different things. Layouts may be long to compute, when you display a thousand edges and nodes with a grid layout, it should be fluent.

Regards

Mathieu