Performance issue with HTML-based plots

[IngoScholtes]

In the latest version of the plot function, interactive HTML-based plots of larger networks are very slow.

For example, the plots of second-order networks for the example in the dbgnn.ipynb tutorial do not work anymore and render the notebook unusable. Changing the network to an undirected network does not help either. Plotting of the same networks worked fine with the previous version.

[hackl]

While working on visualization features, I will take a look at this issue. Do you have an example code to reproduce this behavior?