It sounds like you're saying that you did become slower. I.e. you weren't always slow. However, it isn't due to health. It may be constructive for you to figure

It sounds like you're saying that you did become slower. I.e. you weren't always slow. However, it isn't due to health. It may be constructive for you to figure out where the efficiency went. Perhaps start with when it went. It could be something that you could reverse, or it may just make it clear to you what you're trading off.