McLaren introduced a new package in Baku which represented the car it felt it should have started the season with, adhering to a different floor philosophy that tried to address the lack of efficiency of the Woking team's launch spec MCL35.
But while the new floor delivered a small boost once it was put on the car in last week's Azerbaijan Grand Prix, the car's continued inefficiency was still plain to see, with Lando Norris unable to pass Haas' Nico Hulkenberg for large spells of the race due to a lack of top speed, before finishing ninth.
"Well, we still have too much drag, which is pretty obvious, and so we need to create downforce without the drag," said Brown, whose team is fifth in the standings, having benefited from rival Alpine's misfortune.
"We did bring some new bits to the car. We knew, as we said at the start of the year that it was going to be a bit of a slow start, so it was good to see the team did an excellent job with the upgrades.
"More to come but that's what the nine other teams are doing."
Source: Autosport