Alex Albon believes the windy conditions at the Circuit of the Americas caused a tricky practice session for the team.
While Albon ended FP1 with the 13th quickest time, the Williams driver slipped to 18th fastest in the second session which was extended due to the Pirelli tyre tests.
Given the windy conditions are set to pick up throughout the weekend, with gusts between 40kph and 50kph expected, Albon says the team will "need to improvise" if they want to improve their chances.
"We're 13th on the timesheets and there's a little bit more time there. So it's tricky, it's very windy out here," Albon told media.
The wind is only going to get worse during the weekend; we're expecting I think 60kph gusts at some points and that doesn't tend to suit our car too much.
"We'll need to improvise, there is definitely some things we need to change from today into tomorrow. Just to be more competitive, it seems like sector three is our killer right now."
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Albon enjoys 'old school' tarmac at COTA
The Circuit of the Americas resurfaced part of the track to suit the MotoGP event earlier this year, however Albon says he enjoys the "old school" tarmac sections of the circuit more because of challenge they pose.
He added: "Obviously it's worse on bumps than previous years. But generally speaking, sector one they've done a good job, but sector two and three [has that] old school tarmac which you feel much more.
"In some respects, I think it gives it character. It's nice to drive some tracks that have these big bumps and you've got to think about your driving.
"You can't just brake in the normal places, you have to move around a little bit with your lines to try and avoid some of the bumps. So I prefer that to ice rink driving."