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The increasing popularity of heterogeneous Web-enabled devices and wired/wireless connections motivates the diffusion of content adaptation services that enrich the traditional Web. Different solutions have been proposed for the deployment of efficient adaptation and delivery services: in this paper we focus on intermediate infrastructures that consist of multiple server nodes. We investigate when it is really convenient to place this distributed infrastructure closer to the clients or to the origin servers, and which is the real gain that can be get by node cooperation. We evaluate the system performance through three prototypes that are placed in a WAN-emulated environment and are subject to two types of workload.