For example if it says 30 seconds, and they are doing 10 reps, it's too fast for me and I get overstimulated by the fast-paced movements.

Will I get the same effect if I just do 3-5 reps in the same 30 seconds, just doing them very slowly? Or do I have to do them quickly?

It's not a matter of "I physically am unable to do them quickly", it's that I have mental health things that make fast-paced movements feel stressful and make me panic.

I like the speed of slow yoga, but I'm not sure if I can do that with bodyweight exercises. If not, I will have to try a different method.