ACR FLC TAKES EVASIVE ACTION ON A VISUAL APCH TO AVOID ANOTHER ACFT ON A FINAL APCH TO A PARALLEL RWY.

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WE WERE BEING VECTORED FOR THE VISUAL APCH TO 26L AT DENVER. APCH CTL ISSUED TFC AHEAD OF US ON FINAL FOR 26R. WX WAS CLR AND 40 MI VISIBILITY. WE RPTED THE RWY AND THE TFC IN SIGHT AND WERE CLRED VISUAL APCH TO 26L. THE OTHER ACFT GOING TO 26R BEGAN OVERTAKING AN ACFT IN FRONT OF HIM ALSO GOING TO 26R. HE REQUESTED 26L. APCH CTL ASKED US IF WE WOULD TAKE 26R. WE WERE JUST BELOW OUR MAX GROSS WT FOR LNDG AND WANTED THE LONGER RWY (26L) AND TOLD APCH WE WOULD PREFER 26L. APCH RE-ISSUED CLRNC FOR THEM TO CONTINUE TO 26R AND US TO CONTINUE TO 26L. EVIDENTLY; THE OTHER ACFT BEGAN A SPD REDUCTION AND SLOWED RAPIDLY. AT OUR HIGH GROSS WT AND SUBSEQUENT HIGH AIRSPD WE COULD NOT STAY BEHIND THE OTHER ACFT. WE MOVED TO THE L OF THE 26L LOC TO GIVE AS MUCH ROOM AS POSSIBLE AS WE WENT BY THEM AND MADE A NORMAL APCH TO A NORMAL LNDG. WE HAD THEM IN SIGHT CONTINUOUSLY. THERE WAS NO REAL CONFLICT; NO PROBLEM; BUT WE WERE NOT ADVISED THAT THEY WOULD BE SLOWING. I DON'T KNOW IF THEY WERE SURPRISED OR NOT WHEN WE PASSED THEM. I KNOW SOME OF OUR PAX ASKED IF IT WAS 'NORMAL' 'TO BE CLOSE TO ANOTHER ACFT LIKE THAT.' I DON'T KNOW WHAT A SOLUTION WOULD BE. POSSIBLY FOR APCH CTL TO PROVIDE GREATER SPACING ON VISUAL APCHS TO PARALLEL RWYS THAT ARE TOO CLOSE TO ALLOW SIMULTANEOUS INST APCHS. THANK YOU.