Other than the throttles on SMS, and cfdocument etc, standard itself won't provide any specific performance improvements. You may be considering running enterprise and using multiple instances of ColdFusion for each site. Other than being able to allocate more memory to each instance, you won't neccessarily get any performance out of it if they are all running on the same server. What you will get is separation of one site from another (One instance may go down, but the others won't) and redundancy if you are using more than once instance for each site in a cluster (Through JRrun's load balancing).
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