andrea stella confirms lando has a straightline power deficit and mclaren is investigating it:
"on lando's side specifically, we observe a deficit of power that we are investigating. it seems to be linked to some behaviour of the fuel injection, something that hopefully we, or the adaptive systems, should be able to improve for tomorrow.
it looks that occasionally the power unit generates a bit less power, but this is a specific phenomenon, a specific issue. it has nothing to do with the overall behaviour of the power unit"