Of course, since the Dogecoin client software hasn't been updated in the past two years it lacks the rather substantial performance optimisations that Bitcoin has developed over that time period, so it's not clear how well it would actually cope if it ever had to handle a transaction rate anywhere near its theoretical limit. (Or, for that matter, if miners are actually willing to process that many transactions.)

Sure, but there's no reason to believe that the Dogecoin network is not able to handle 30 tx/s.