when a browser encounters <script src="" it will usually block until the script is loaded before moving on (when no async is used). The result would be a stairc

when a browser encounters <script src="" it will usually block until the script is loaded before moving on (when no async is used). The result would be a staircase pattern: http://www.webpagetest.org/result/121024_GH_A1Q/1/details/ http://www.webpagetest.org/result/121024_GH_A1Q/1/details/ For assets like images it would allow parallel connections until the configured limit.