A method and system for providing and dynamically managing the size of a storage space containing data structures depending on a current network load. The present invention expands the size of a storage space when the amount of data therein is large, thereby reducing the time spent searching for values within the data structure. When the amount of data within the storage space is small, the present invention contracts the size of the storage space to reduce the memory needed to maintain the storage space. In this manner, the present invention dynamically adjusts the size of the storage space in response to changing network loads to ensure that network performance remains optimized.