Sauber's head of track engineering Giampaolo Dall'Ara says the Swiss squad must react to a disappointing performance in the Hungarian Grand Prix at the Hungaroring.

Just a week after snaring a double top six result at Hockenheim, the team failed to pick up any points in Budapest after a tough race where Sergio Perez and Kamui Kobayashi failed to recover from a disappointing performance in qualifying.

Perez took the chequered flag in 14th place and admitted afterwards that the team had simply lacked the pace to challenge, while Kobayashi also failed to make an impression - stating that the team had been 'too slow' before he retired one the penultimate lap with a hydraulic leak.

"In the end we finished as high as we could this weekend," Dall'Ara said. "It's difficult to judge our race performance because our drivers were stuck in traffic for quite some time.

"Kamui lost some positions at the start, which made things difficult for him. We pitted him earlier than planned to get him out of traffic, and this helped a bit. However, halfway through the race we discovered there was a small hydraulic leak which became worse and worse, and we decided to call him in one lap before the end of the race.

"Checo gained a position at the start, but we were still outside the points. Therefore we decided to take a risk and extend his first stint, looking into the possibility of making just one stop. But the tyres didn't last long enough, so in hindsight it didn't pay off. We also delayed the second stop, which helped Checo to catch up some of the other drivers, but in the end we have to accept overall this weekend we were not fast enough.

"We have to react to this."

Despite failing to score, Sauber remains sixth in the standings going into the summer break.