[binaryturtle]

Why would the mouse polling speed mess up the circle drawing itself? You record the start position point (center) and then get the new mouse position and calculate the delta to the start position to get the radius, then draw the circle with the values. Same algorithm.

[unwind]

They did not mean a circle drawn by a circle tool, but instead freehand drawing curved shapes.

[ChristopherDrum]

Correct. I did not say anything about the circle tool being slow.