Adam Peaty felt there was more to come after he won the men's 50 metres breaststroke final in 26.49 seconds to claim his second gold medal of the British Championships in Glasgow.
The Olympic champion completed the double on Wednesday, having already claimed the 100m title on Tuesday evening.
Peaty, 24, who had recorded a time of 26.51 in his heat, finished ahead of Stirling University duo Ross Murdoch (27.45) and Craig Benson (27.74) at the Tollcross International Swimming Centre but felt he had "rushed it a bit".
The Loughborough-based swimmer said: "For me, it was just about getting out there and swimming.
"I am a little bit disappointed, as disappointed as you can be with a 26.4 because I put expectation on myself but at this time of the year the speed just doesn't come that easy.
"If I had done that at the Commonwealths last year I would have been very happy but it is what it is.
"It is April, I am in good shape and I am just looking forward to what we can do in the future.
"Tonight I was expecting it to be a little bit quicker but you don't always get what you want to get.
"I think I rushed it a little bit. "I don't know where you can take 50 breast, I know there is definitely a 25-mid in there somewhere but maybe that comes with an even faster 100, who knows?"
The men's 200m butterfly was won by James Guy in a time of 1:56.51. Guy overcame the University of Stirling's Duncan Scott, with Jacob Peters coming in third.
Georgia Davies took gold in the women's 100m backstroke with two lengths of the pool completed in 1:00.31. Jessica Fullalove came second, with Kathleen Dawson taking bronze.
Luke Greenbank was just too strong for the field in the men's 100m backstroke final but, like fellow gold medal winners, Guy and Davies found the finish was outside the consideration time for the world championships.
He touched home first in 53.92, ahead of Joe Litchfield, with Nicholas Pyle just behind.
In the women's 200m breaststroke, the final race of the night, Molly Renshaw took gold with a time of 2:23.42, a time good enough for consideration for the world championships. Katie Matts was second, with Jocelyn Ulyett third.
Speaking post-race Renshaw told www.britishswimming.org: "That's what I wanted, to get it ticked off early. I would have liked to have gone faster as I'm training well and I'm really consistent and I'm so much stronger in the gym and pool, so I thought it would be faster, but this time of year I've got to be happy. That's definitely given me a confidence boost."
Earlier in the evening, Charlotte Atkinson won the women's 50m butterfly, beating Harriet Jones and Sophie Yendell with a time of 26.80.
