The Enstone team has made a major concept change since last season and knew that it might take time to optimise.
On overall times for the three days, Esteban Ocon and Gasly were 16th and 17th of the 20 drivers participating.
While on balance the A524 is not actually the slowest car in the field, the team is still far from where it wants to be.
"To be fair I haven't really focused on others because there's been so much going on our side," Gasly told Sky F1.
"I don't think we look great. But at the same time, we still have a couple of days to really understand everything we've done.
"We've put the car upside down, done a lot of tests. So hopefully, some analysis and answers will bring us some more performance. And then, we'll find out, no one will hide any more next Friday.
"But I think we'll have to be patient, even if it's not what we like as drivers, but clearly it might take some time before we really unlock the performance we want from that car."
Source: Autosport