I'm trying to implement a simple system to load certain namespaces into my 
application that are configurable at runtime, via a "plugins" text file 
that lists the namespaces we want to load.  I have some code that loads 
this file, then line by line calls "require" dynamically, like so:

(doseq [plugin plugins]
  (require (symbol plugin))

Each "plugin" namespace attaches itself to the central event bus and 
listens for events.  

My question is:  how bad is it that I'm doing this?  Am I taking any kind 
of major performance hit by dynamically calling "require" like this?  

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