Williams drivers Pastor Maldonado and Valtteri Bottas will have to wait until May's Spanish Grand Prix before significant upgrades will be fitted to the Williams FW35.
Williams, who finished in eighth place in last year's championship, failed to register a point in the opening two races.
Neither Maldonado nor Bottas has managed to qualify higher than sixteenth place.
Technical director Mike Coughlan insists that the three week break has allowed the team to make progress.
"After a difficult two races we’ve been back at the factory going through the data to try to understand where we need to improve. We feel we have a better understanding of where we are and the whole team has been working hard to improve our competitiveness going into the next few races".
"Ultimately we are looking at a significant upgrade for the Spanish Grand Prix."
Maldonado, who has retired from both races this season, concedes that Williams will take time to reach their potential.
"We haven’t had the best start to the season and we need some time to improve our car to be solid in the points, but the whole team is working very hard so let’s wait and see how we can adapt the car for this race," he said.