What does it mean for SVN "to pollute the local source tree"?

Posted by asd on Programmers See other posts from Programmers or by asd
Published on 2012-07-11T13:54:14Z Indexed on 2012/07/11 15:22 UTC
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I'm reading "Professional Team Foundation Server 2010" by Wrox, and in an advantages/disadvantages list, the said:

"Like CVS, SVN makes use of .svn directories inside the source folders to store state of the local working copy, and to allow synchronization with the server. However, it can have the affect of polluting the local source tree, and can cause performance issues wiht very large projects or files."

What does the bit about pollution mean? I've used SVN for C# & ASP.NET projects for a long time and haven't encountered any problems. What probably does this quote think I should have been watching out for?

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