High school times are notoriously exaggerated. I think some of you are also mistaken with this muscle / weight speed trade off.
Adding muscle doesnt necessarily make you slower just because you've added weight. Depending on where the muscle is going, the power the added muscle provides is likely to more then offset the negative speed effect of the weight. This is why sprinters lift weights. Now if you go all frat boy juicy and just try to build up puffy pecs and triceps...while neglecting hip flexors and core...then it probably will slow u down.