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Very slow with many nodes #154

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@ahmidou

Hi, I was testing different ImGui node based solutions for large graphs and found out imnode doesn't scale well with many nodes.
for 500 nodes I'm under 4fps vs 150fps in imgui-node-editor.
The first curlpit happends when generating the nodes procedurally and they are all overlapping the ResolveHoveredPin is taking forever and the applicayion just doesn't respond anymore..
If I make sure the node are not overlap, the prefs are still very low ( < 4 fps)

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