From time to time I access my work emails through Outlook Web Access (OWA) – which works really great on all browsers I run on my laptop (IE, FF, Chrome). Guessing that Microsoft probably optimized OWA for its own browser I thought that I will definitely find JavaScript code that doesn’t execute that well on Firefox as compared to Internet Explorer. From an end users perspective there seems to be no noticeable performance difference – but – using dynaTrace Ajax Edition (also check out the Video Tutorials) I found a very interesting JavaScript method that shows a big performance difference when iterating over DOM elements

Allow Multiple DOM Elements with same ID? That is Not a Good Practice!

I recorded the same sequence of actions on both Internet Explorer 8 and Firefox 3.6. This includes logging on, selecting an email folder, clicking through multiple emails, selecting the Unread Mail Search Folder and then logging out. The following screenshot shows the Timeline Tab (YouTub Tutorial) of the Performance Report including all my activities while I was logged on to Outlook Web Access.

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