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Ngons + Subdivision modifier causing massive performance issues
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System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 419.67

Blender Version
Broken: version: 2.80 (sub 61), branch: master, commit date: 2019-05-11 18:20, hash: rBebc44aae9897
Worked: (optional)

I have an object called 'Base' in the attached blend file. It has a number of ngons. It has a sub surf modifier. If I add another object, such as a circle and attempt to use the Last Operator panel, each operation takes around 22 seconds. Undos take an equal amount of time. If I delete or triangulate the ngons the problem is mitigated. If I turn off the Subdivision modifier the problem is also much lessened. The same object appended to 2.79 causes no such performance issues. It's largely down to poor modeling practices on my part, but it feels wrong and I wonder what's causing it?
[Please fill out a short description of the error here]

1 Open file
2 Shift+A and add a Circle
3 Change the number of vertices in the Last Operator panel
4 Note the time it takes before user control is returned
5 Move the newly added circle
6 Undo
7 Note the time it takes before the undo operation is completed.