We look at a variety of factors but most importantly, performance is determined by the quality of traffic you send to the merchant’s site along with your ability to drive sales. If you send thousands of clicks to a retailer but drive very few sales, then your performance will be determined to be poor. On the other hand, if you drive clicks and sales, then your performance will be deemed great for that retailer. Each merchant does have its own unique budget and sales goal in mind so this means achieving adequate performance across merchants will vary.