Libby Lenton is becoming such a swimming perfectionist, even when she is winning comfortably she is not entirely satisfied.

Lenton collected her third victory of the World Cup meet at Sydney's Olympic Aquatic Centre on Sunday night adding the 100m freestyle to her 50m and 200m wins on Saturday.

The Queenslander was 0.01 seconds under her own world record at halfway but faded in the last 50m to finish in 52.17secs - 0.47 off her best time swum in August this year.

Marleen Veldhuis of Netherlands was second in 53.24 with Alice Mills third in 53.28.

It is the first time Lenton has not swum a PB at this meet - her 200m was a new world record and 50m a new Commonwealth record.

"Considering my form I probably had more expectation tonight but I was just hoping to go under the old (world) record and I did that," said Lenton.

"I am not too upset. There were a few things I could improve from that race, I definitely missed that last turn on the wall."

Lenton believes her biggest challenge now, especially heading towards the Commonwealth Games next year, is to learn how to continually perform at her peak and not get carried away with success.

"I have to deal with backing up. I can handle backing up after a disappointing swim, it's just backing up after a good swim (is what) I have to learn to do," she said.

"I kind of put pressure on myself when I am swimming so well and I want to keep doing well the next time."

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