According to what you said, it is not necessarily diagnosed as obsessive-compulsive disorder, but an obsessive-compulsive tendency. Being serious, cautious and careful in some aspects will really affect our work efficiency.

First of all, you can do a small experiment for yourself, try to do it slowly and limit the time of other students. Is there a big difference between the homework done in the two situations?

About the untidiness of format writing, it may just be your feeling. When you feel that you are slowing down again, remind yourself that this may be too much, encourage yourself to let go of your doubts and write it down first. Stick to it and check back.

If you want to know more about obsessive-compulsive disorder, I recommend you to read the book "Out of obsessive-compulsive disorder-looking for a better life", hoping to help you!