hi i want to buy domain and i dont know that domain format .com or biz or local domain names does have any effect on website loading speed ?
No, the domain names will not impact the performance. Pick whatever works best for you. Who you choose to do the hosting and DNS WILL have a big impact on the performance so pay attention to that piece.
You can have your DNS resolver like ultradns, dnsmadeeasy, dyn dns, cloudflare.
I really wonder which one performs the best.