What is limiting the performance? It is MUCH slower than the WPF version!

[DrDryg]

I've compared this port with the WPF version. If the number of nodes, and more important the number of connections, is moderately large: Perhaps 50 nodes and most connections are made, the UI becomes slow and lag a lot.

To reproduce: In the playground example generate a graph with 50 nodes. Press the Connect/Disconnect 10 times to add connection. Now moving a node cause a lot of lag.

Doing the same thing in the WPF original Nodify results in a very responsive UI.