Alex Albon believes Williams will struggle to make progress in Formula 1 until the team can bring further upgrades to its car.
The Thai-British driver finished 16th at the Spanish Grand Prix having made up only two places from his starting position.
Williams has shown promising signs compared to last season by moving forwards into F1's midfield pack, though results have provided just one point from seven races to keep the team rooted to the bottom of the Constructors' standings.
"We were expecting to be quite bad on race pace [in Spain] but we ended up not being as slow as we thought," he told media, including RacingNews365.com.
"I'm happy. I think we did a good job."
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Williams limited by lack of upgrades
Whilst displaying a positive attitude to his race, Albon was less optimistic over Williams' future prospects and explained: "The thing is, we can't really get too much better because we don't have upgrades.
"We can do so much with the set-up of the car and improve it that way, but we've got to wait for that to happen really.
"It [feels] like we're optimising our weekends, I don't really think we did too much wrong in qualifying or in the race [in Barcelona].
"Unfortunately these kinds of 'normal' circuits expose us a little bit. Hopefully, when we go to a track like Canada we can do a bit better."