Adbuff requires that your site loads in a reasonable amount of time for visitors all over the world. It's also important for our integrity that when our ad code loads, that your site has fully loaded to register a fair impression.
While performance issues do happen from time to time which is out of our control, we have implemented a "three checks and your out" rule in approving your site. We will check your site at least 3 times before approving it and if you have performance issues all 3 times, we will reject your site for this reason.
The best way to improve performance issues with your site is to migrate to a reputable host.