How to disable downsampling during rotation
When Not Rotating
During Rotation
This is called Level Of Details (LOD)
. You can disable that from Edit > Settings > Render View
by setting a high LoD Threshold
I do want to mention that LOD has it’s advantages. You are basically spinning a smaller version of your data, and LOD will allow you to move your dataset with (as a guess) 10 to 100 times better frame rates than the original dataset. Obviously, your mileage may vary depending on the size of the dataset.