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Timo Glock has called on Virgin to make a "bigger step" with its 2011 campaign.
The German driver told Auto Motor und Sport that he is happy that the team's new car is much more reliable than its predecessor.
But as for the performance, Glock said: "We are closer (to the pace) than we were, but we still need to make a bigger step with the speed."
The report said Virgin's nearest 2010 competitor, Team Lotus, is at least a few tenths ahead at present, and that the situation is clearer at Barcelona than it was at Jerez recently.
"It shows us clearly that we need more downforce," admits Glock. "That's what counts the most in Barcelona."