Felipe Massa has admitted that he is somewhat frustrated by the way his Williams career has started.
After the first four races of the season, the former Ferrari driver has amassed only 12 points, and while he looked destined to finish in the top six in China last week, he had to settle for 15th place - one lap down - after he lost almost a minute because of a left rear wheel problem during his first pit stop.
"I'm frustrated for what has happened [in China] and I'm frustrated for what has happened in many races," Massa told Autosport.
"The first race, somebody [Kamui Kobayashi] pushed me out and I lost massive points then [in Bahrain] I was fighting for third or fourth and then after the safety car I finished seventh, so I have lost points.
"This race is another problem that has cost me points. I feel I have started well in terms of pace but I have not been lucky.
"We had the car [in China] to finish in front of Force India, and it is third in the championship so it's a team we need to try to be in front of and score more points than.
"Also, it was a race in which we could maybe have caught and passed McLaren [for fifth] as well.
"It's something we need to work on and try to have more consistent races and score more consistent points."
Nevertheless, Massa is confident that the influence of new head of vehicle performance Rob Smedley - who was the Brazilian's race engineer during his time at Ferrari - will improve the team immeasurably.
"We need the organisation and the procedures, that's something that we are working very hard on and something I've tried to [help with] since the first day of testing," said Massa.
"And Rob has some very important notes about things but there is some good potential and I'm sure we will make some improvements."