Embodiments of the present invention provide an approach for an enhanced pub/sub environment whereby a peer group of publishers is defined and can collaborate to determine when to cache data being sent to a common broker or brokers. Specifically, in a typical embodiment, configuration data or the like will be read to define a peer group among the publisher systems in the pub/sub messaging environment. Once such a group has been identified, communication therebetween will be established. Once cacheable data has been identified, a unique identifier/set of cache keys will be generated corresponding thereto and associated with the set of data. A message comprising the set of data and corresponding unique identifier will then be sent to a broker system (e.g., from the publisher system(s)), which will store (or have stored) the set of data in a cache, and pass the underlying message along to applicable subscriber system(s).