Losing time on a straight to Jenson can only mean one thing - more drag. There is more to this than just the choice of rear wing and we know Lewis was running more downforce.
However, he struggled to match his team-mate's pace in final practice and, following a session debrief with his engineers tweeted: "Car is not fast enough at the moment but have made some big changes."
One of those changes would see Hamilton move to a high-downforce set-up, while team-mate Button was more comfortable with the new low downforce version.