Its based on each split.

Found a quora link with more details: [1]

[1] https://www.quora.com/How-is-the-yellow-world-record-line-in...

So the line is most accurate towards the end of a lap, and probably quite inaccurate at the start (given how much speed you gain during a coming out of a turn).

That probably works in the favour of the broadcaster if you don't understand how it's calculated. Exciting to see people on the line of the WR.

>No point being animated then, as it's unlikely to be accurate.

The point isn't to show how the pacing would look if you lined up all the winners. It's to show the difference in finishing times throughout the century plus.