Haas driver Kevin Magnussen has laid part of the blame for his team's lack of performance this season at the door of power-unit provider Ferrari.
Magnussen and Romain Grosjean were clearly far from happy after setting the slowest times in second practice ahead of Sunday's Styrian Grand Prix.
While the team struggled with unusually high levels of tyre graining last season, Magnussen does not believe the focus on fixing that particular issue has weakened other areas of the car.
"I don't think that's the problem this year," said Magnussen. "I don't think anything the team has done has made the car worse at all. There are different reasons for that.
"I think, if you look at all the Ferrari-powered cars, there are some similarities, and I think that's probably something that is holding us back a little bit."
All three Ferrari-powered teams - Haas, Alfa Romeo and the Scuderia itself - have struggled for straight-line pace in 2020. Ferrari team principal Mattia Binotto confirmed after Sunday's Austrian Grand Prix there was a 0.7secs gap in this area.
Magnussen added: "All I see is we are slower on the straights this year compared to last year, having to drop more downforce than we did last year. That's all I know.
"I can't even say for sure that's the engine. I can just conclude that we're slower on the straights, and we're having to drop more downforce than last year."
Asked if the extra cooling being run to prevent a repeat of the brake overheating problems of a week ago was a factor in the loss of pace, Magnussen added: "It has had a little bit of an impact, but not a huge amount."
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.