Todays' DNS resolving platforms have been designed for DNS with fast and light resolutions over the Internet. With signature checks and larger payload, experimental measurements [10] showed that DNSSEC resolutions require up to 4 times more CPU. While DNSSEC requires more CPU than DNS, this paper proposes PREFETCH X , an architecture that optimizes the use of CPU and thus avoids that resolving platforms increase their size for DNSSEC migration. Current resolving platforms IP XOR split the traffic between the nodes according to the IP addresses. Alternatively, PREFETCH X takes advantage of the FQDN's popularity distribution (Zipf), a layered cache and cache sharing mechanisms between the nodes and requires at least 4 times less nodes. Furthermore PREFETCH X does not impact the network infrastructure which eases its deployment. Then, defining X the number of prefetched FQDNs makes PREFETCH X highly scalable and flexible to different type of traffic.