We changed the setup on our PRTG host , we have the display spanned over 2 vertical stacked 17"monitors each displaying half of the sunburst.
Now the circle map is very big , but the text in circle map is almost unreadable small , even if you are standing in fromt of the monitors.
It seems that the autofont size calculation doesn't copy with a map of 2000x2000 pixels ... I have a screendump if you need to see it for youself.
I have names only taking up 5-10% of the whole field they are positioned in.