Bug report

Bug summary

I've stumbled across something that can arise when point sizes are excessively large, so the only few lines that matter are

ax.scatter(xcoords, ycoords, s = pointsizes, **kwargs) 
plt.savefig("figname.pdf") 

The bug arose when an element of my pointsizes array was unintentionally over 1e35. This would save a PNG figure, but caused it to take excessively long in saving a PDF that I thought the program had stalled. The point sizes were based on the median value of a set of masses, some of which were very near zero. When I filtered the data more strictly to remove these outliers, the point sizes were much more reasonable and the figure was produced as expected - that is, once the pointsizes array didn't have these excessively large values, the runtime was normal.

It may be useful to have a prescription for determining maximum allowed point sizes, or have a RuntimeWarning raised when point sizes are excessively large, if this isn't in the docs already.

Matplotlib version

• Operating system: Mac OS X Catalina
• Matplotlib version: 3.2.2
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: 3.7.4
• Jupyter version (if applicable): N/A
• Other libraries: N/A

Matplotlib installed via pip