Valtteri Bottas feels Williams have made progress in Spain having brought several upgrades to the Barcelona circuit.
Williams arrived at Barcelona as the only established team not to have scored a single World Championship in the opening four grands prix.
The team brought several upgrades to the track including a new aerodynamic package.
And Bottas, who finished 14th quickest - 2.080s off the pace, believes they've already made a difference.
"It felt like the upgrades were working well. I think we are taking small steps forward all the time," he told Autosport.
"So far it's felt like the best car we've had this season.
"It's nice to see all the hard work has paid off a bit.
"I think it's definitely a step forward, but how it will show compared to others is too early to say. I really hope we're closer."
He added: "It feels a bit more consistent, easier to know what it will do next.
"I was really comfortable in the car today for the whole day, even though the conditions were quite tricky."