the "use concurrent pool" is too technical and an implementation detail. the label should mention "parallel downloads"
the default number of concurrent connections should be increased to 6. see http://sgdev-blog.blogspot.fr/2014/01/maximum-concurrent-connection-to-same.html
Date: Wed Feb 17 22:46:36 2016 New Revision: 1730963 URL: http://svn.apache.org/viewvc?rev=1730963&view=rev Log: Bug 59023 - HttpSampler UI : rework the embedded resources labels and change default number of parallel downloads to 6 Bugzilla Id: 59023 Modified: jmeter/trunk/src/core/org/apache/jmeter/resources/messages.properties jmeter/trunk/src/core/org/apache/jmeter/resources/messages_fr.properties jmeter/trunk/src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPSamplerBase.java jmeter/trunk/xdocs/changes.xml
This issue has been migrated to GitHub: https://github.com/apache/jmeter/issues/3835