That's hard because it's a cycling animation and a red ball to track would require unique frames for its entire cycle while the current setup requires only unique frames for the interval between two identical balls passing the same spot.
Now I understand why computers cost so much! It's got those 2 guys passing the box back and forth, they must be expensive. And when they get tired, we get lag!
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also the cost of computers is going up cos the little guys are suffering from repetative strain disorder