Advertising servers play an important role in the entire contrary e-business. In this paper an approach for a high performance ad server is proposed. A prototype of a new architecture is presented: system achieving scalability by multiplication of ad servers with separate local memory storage and single managing server for entire cluster of those, providing data processing and ads preparation.The paper includes benchmarks of alternate technologies possible at the design stage, results of the stress tests of the prototype, as well as the data from its performance with real web traffic. Limitations of the proposed solution are discussed. Although the prototype is created on a specific platform, all technologies used are widely available or have replacements on other platforms, granting generality to the proposed solution.