

Russell Still had the straight line speed issue in the race as well
This is data from Lap 15, both cars were in free air, Kimi had settled after his battle with Lewis and George had 4 seconds gap in front, so they were running the basic strat mode for this lap.
the time difference stays relatively flat when they are in corners but completely grows whenever they are on a straight.
George is the blue line
Kimi is green.
It's about 0.3 - 0.4s the lap time loss for George and this isn't just one lap it's happening on every lap.