The present invention is directed towards systems and methods for efficiently an intermediary device processing strings in web pages across a plurality of user sessions. A device intermediary to a plurality of clients and a server identifies a plurality of strings in forms and uniform resource locators (URLs) of web pages traversing the device across a plurality of user sessions. The device stores each string of the plurality of strings to one or more allocation arenas shared among a plurality of user session. Each string is indexed using a hash key generated from the string. The device recognizes that a received string transmitted from a webpage of a session of a user is eligible to be shared among the plurality of user sessions. The device determines that a copy of the received string is stored in an allocation arena using a hash generated from the received string. The device uses the copy of the received string stored in the allocation arena in place of the string in the web page of the session of the user to process the web page.