In 2010, she improved her placing with a 5th place at the 2010 Ironman World Championship. She continued to show improved results in 2011, notching a win at Ironman Lanzarote and taking second at Ironman South Africa and Ironman 70.3 Ireland. At the Ironman World Championships that year she missed a podium spot by taking 4th at the race, just behind Leanda Cave. A month later Joyce won the 2011 ITU Long Distance Triathlon World Championships over second place Cave. There was further success in 2012 as Joyce won Ironman 70.3 Kansas, Ironman 70.3 Muskoka, and Challenge Roth to also claim the European Long Distance Triathlon Championship. She also took second against a strong field of competition at Ironman Melbourne and 5th at the Abu Dhabi International Triathlon. At the 2013 Ironman Texas race, Joyce grabbed her third Ironman win by leading from start to finish and beating the second-place finisher by 36 minutes. That same year, coming into the 2013 Ironman World Championships, Joyce was considered to be among the favorites to win the event. In the race she was leading during the run, but was overtaken midway through the marathon by Mirinda Carfrae. Joyce would hold on to her position to finish second, her highest finish at the championship event. Her finishing time was the 5th fastest women's time in the Championship's history and the fourth woman to have broken 9 hours at the event. Joyce's notable achievements include: