I made the arcs draw a bit faster by making it rotate/move a step instantly a few more times per loop. Now, it only has to loop 75 times (Scratch loops run about 30 times a second, so it will only take 2.5 seconds) Since it moves 4 steps every loop, and there are 30 loops a second, it means the pen draws 120 steps/pixels a second. Using that speed, I calculated the speed for the glide block to match. The first line segment moves 90 pixels long (87 - -3), so 90px divided by 120px/secs = 90px * second/120px = 90secs / 120 = 0.75 seconds. The second segment is 81 pixels long. Credit to @-Pristine- for the original