Queens Park Rangers have won their last three home matches.
Hasselbaink made a slow start after taking charge at QPR, winning just two of his first 14 matches in the hot seat.
However, there have been major signs of encouragement in recent weeks and QPR won 3-0 against Brentford yesterday to raise optimism levels even further.
Rangers looked highly accomplished throughout the match and Hasselbaink was pleased with the organisation levels that his side showed.
"We were organised, we showed quality and we were very, very impressive in parts," he said.
"I was just as pleased with our performance without the ball as with it. That shows me we are making progress and that the boys are taking everything on board.
"It was a great win – a great win for the fans of this football club.”
QPR have now dispatched with Birmingham City, Derby County and Brentford in their last three home matches.
In those contests the R’s have scored a combined total of seven goals without reply and the squad seem to have adapted to Hasselbaink’s methods now.
There is talk starting to emerge that Rangers could make a push for the play-offs yet, but Hasselbaink was keen to ensure nobody got carried away after the match.
"But we need to keep improving," the Dutchman added. "We need to keep getting better. But that will take time.
"We want to finish the season as strong as possible – and that is the challenge.”