I'm a bit slow at things, also due to perfectionism, but then I get another dose of anxiety and that usually speeds me along if I know people are watching. I do daydream a lot too, and I think that contributes to the slowness sometimes. I did have a friend once who did everything super slowly, and eventually I found out that she was diagnosed with major depression.
Possibly related but possibly not, I have these moments where everything appears to be moving incredibly fast, and I perceive myself as moving ridiculously slow, but in reality I think I'm moving at a regular pace and it's just some weird anxiety thing affecting perception.
"How could you tell if your instincts were just hope in disguise, and if your hope was really desperation parading as possibility?" ~Laini Taylor