They may have run out 5-1 winners over relegation candidates Rotherham United but QPR manager Ian Holloway admitted there was still room for improvement.
Goals from Matt Smith, Luke Freeman, Yeni Ngbakoto, Massimo Luongo and Nedum Onuoha were enough to cancel out Joe Newell's spectacular effort.
But Holloway revealed the first 45 minutes had left him cutting a frustrated figure.
He said: "I was delighted with the second-half performance but I didn't enjoy the first-half at all.
"We scored early then thought we'd done enough. We didn't move the ball sharply enough and didn't press hard enough.
"I spoke about changes at half-time which stopped them playing long over the top of us and stop them pushing out back three deep so that we could play high enough.
"That meant we could win it and actually cause their back four the problems I felt that we could and in the end we got what we deserved."
The deadlock was broken as early as the fifth minute when Smith latched onto a long ball from Idrissa Sylla to fire clincally past Lewis Price in the Rotherham goal.
The Millers were level in the 13th minute when Newall scored the goal of the game, striking a fantastic half-volley past Alex Smithies from 25 yards.
Two minutes later QPR were back in the lead when poor defnding from the Rotherham centre-hallf pairing of Semi Ajayi and Aimen Belaid allowed Freeman to steal in and calmly roll the ball passed Price.
The first-half continued in a scrappy fashion with neither side managing to keep hold of the ball for long enough to create many chances.
Rangers were quick out of the blocks after Holloway's half-time team talk and had the opportunity to go further ahead four minutes into the second-half when Belaid was adjudged to have climbed on Smith.
The impressive Ngbakoto stepped up to send Price the wrong way and roll the ball into the right-hand corner of the net.
Eight minutes later the game was over as a contest when Luongo glaced Ngbakoto's left-wing cross into the bottom corner of the net.
Substitute Conor Washington was unlucky not to get his name on the scoresheet seeing his rasping drive hit the foot of the post and fellow replacement Ravel Morrison could only drag the follow-up wide.
Rangers secured their biggest win of the season on the stroke of full-time with Onuoha ghosting in to convert from Ngbakoto's left-wing free-kick.