There is a forum thread up that can aid in solving some of the SAS4 lag especially if you are a chrome user. http://www.kongregate.com/forums/2609-sas-zombie-assault-4/topics/424315-fix-your-chrome-lag?page=1#posts-8335939 - Otherwise, just make sure your Flash player is updated to the newest version as well.
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There is a forum thread up that can aid in solving some of the SAS4 lag especially if you are a chrome user. http://www.kongregate.com/forums/2609-sas-zombie-assault-4/topics/424315-fix-your-chrome-lag?page=1#posts-8335939 - Otherwise, just make sure your Flash player is updated to the newest version as well.