ANSWER:

This is your time with Allah. If this won’t lead you to OCD and making you exaggerate things out of its proportion, then this is fine. 

I tend to take too much time to perform my salah (10-15minutes for 2rakat prayer and 15-30 minutes for 4 rakat). I tend to slow my recitation in salah so that I feel focused and also I have less ability to be attentive generally(I’m a non arab). I’m I doing anything wrong by extending my prayer time whereas usually people finish their salah within 5-10 minutes?