Gloucester director of rugby David Humphreys was far from satisfied with his side's performance despite their emphatic 46-10 victory over struggling London Welsh at the Kassam Stadium.

At half-time Gloucester were fortunate to be winning 12-10 but they dominated the second half and once opposition prop Taione Vea was yellow-carded they scored 31 unanswered points in the last 15 minutes.

"For the first 60 minutes, we were disappointing and were showing no improvement," said Humphreys. "We were a little bit inaccurate in the set-pieces and we were getting increasingly frustrated but all credit to London Welsh for putting us under pressure."

Gloucester eventually scored six tries through Mark Atkinson, who crossed twice, Jonny May, Henry Purdy, Charlie Sharples and a penalty award.

Greig Laidlaw kicked four conversions and a penalty, with Billy Twelvetrees succeeding with a penalty and James Hook one conversion.

"I'm delighted with the five points and that little bit of magic from Jonny May provided the spark to cause them problems," Humphreys said.

"I thought the substitutions made a big impact; Mark Atkinson brought us something different in midfield and it is now a 23-man game so having Greig Laidlaw to come on shows the depth in our squad."

Gloucester face Leicester and Saracens in their next games, with Humphreys added: "Let's be judged after the first six games but we have an awful long way to go as we've got to be a lot better than we were tonight if we are going to trouble the best."

Welsh's first-half points had come from a try from Ben Pienaar which Olly Barkley converted and Barkley adding a penalty, before Welsh faded badly after the interval.

London Welsh coach Justin Burnell was deflated with his side's capitulation in the last 15 minutes.

"At 12-10 at half-time we were more than in the game but crucially decisions went against us," he said.

"The penalty count was 20-7 against us and I can't explain why. It seems that we are doing certain things and are penalised and the opposition are doing the same but they are not.

"It's easy to look at the scoreboard and we will have to learn to play for 80 minutes not 60, but it seemed the game changed on its head almost on a flip of a coin."