I created this little test print to check the printing dimensions of my voron 2.4.
All my inner holes (rectangles) have been way off the correct size (over 0.3mm away).
After I activated "external perimeters first" the dimensions are way better now. Lower 0.1mm at most points.

Note: there are no notes on the holes. Size of each hole should be obvious. It should only differ some 0.x mm.

Takes about 40min on my Voron with standard speed settings.