What is the ruling on
performing Salaah without sleeves, is it permissible,makrooh, being disrespectful,
haraam or allowed? 

Answer: 

Wearing a sleeveless or short sleeved garment and performing Salaah is a practice that is in contrast to the Sunnah and should therefore be avoided.(Fataawa Mahmudiyyah Vol. 6 Pg. 654)