Split times of 500 Free at Spire

These split times represent the time it takes for me to swim each successive 50-yard lap during a 500-yard race. The lower the line, the faster I am swimming. The best strategy is to go at a consistent speed for the whole race. However, my recent swims show I am still slowing down toward the end of the race (the lines increase at the right side of graph). I set a personal best last week, and this was accomplished by swimming faster throughout the whole distance. Meanwhile, I am still tired out at the end, and I could improve my overall finish time by keeping a consistent speed.