User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3pre) Gecko/2007121905 Minefield/3.0b3pre Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9b3pre) Gecko/2007121905 Minefield/3.0b3pre The same files take noticeably longer to load when they are loaded locally than when loaded over HTTP. Reproducible: Always Steps to Reproduce: 1. Save the attached files as test.html and test.svg in the same directory. 2. Use File->Open File... to open file test.html 3. Compare the performance numbers with those from https://bugzilla.mozilla.org/attachment.cgi?id=258652 in bug 374037. This loads the same content. Actual Results: My results are https://bugzilla.mozilla.org/attachment.cgi?id=258652 1.47, 2.07, 4.33, 0.67 File->Open File...->test.html 1.37, 4.31, 7.38, 0.76 The middle two are consistently slower - these are SVG rectangles and text elements. Expected Results: I would have expected similar performance for the same content.