Couple of thoughts:
Do you see the same results if you mouse around as compared to using a stylus and tablet?
Is this on Mac or Windows?
My hope is that you're using stylus, and there's some sort of 'readings per second' aspect to that. I wouldn't know how to fix the problem then, but it would be good to know if it's a factor.
For me, on trackpad, I seem to be able to draw at any speed and I end up with the same shape.
I use a Wacom Intous Small tablet and I use a Windows PC
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If you use a mouse or trackpad and do similar speed drawing, does the same problem show up? If the tablet has its own mouse, make sure to test with a normal USB or wireless mouse for comparison.
There are a lot of debates about getting less smooth lines (in other programs, not in Animate). Some of them solved the issue by getting later Wacom drivers.