There is a nice pattern going on:
Zooming on the center to see that the ratnest is the origin of the pattern:
No wonder why KiCad is feeling sluggish afterwards
The array’s parameters
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Can you navigate through it, from upper left corner to lower right?
Unfortunately not anymore, when I tried to delete it KiCad became unresponsive (I close it after 20min 
)
EDIT: But even an small array (50x50) starts showing a pattern already
Zooming in:
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This makes me wonder what are the numerical oddities of the Minimum Spanning Tree algorithm we use for ratsnest calculations… It really produces intricate patterns 
and also makes a nice stress test case. Thanks!
T.
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KiCad still works reasonably well with an array of 200x200 via’s.
I did have to assign a net to the via to get the ratsnest to render.
In the screenshot below I deleted a few smallish rectangular arrays of via’s from it and this takes less then a second.
Selecting the whole array is also quick, but deleting the whole array in one go takes 6 seconds to complete.
Generating a 300x300 array takes 6s, zooming and scrolling is also still doable, but beyond that its suddenly not workable anymore. I tried to delete a small rectangular section out of it, and KiCad is just sitting there at 8% CPU time (6 core 12 tread Ryzen 5600G 16GiB Ram, KiCAd uses 1.1GiB) So I just closed it after a few minutes, and Linux gives the nice popup after a few seconds that the program is not responding:
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I wonder why the pattern on your screen is more like concentric circles and for me produces some linear artifacts coming from the center.
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