While investigating the performance issues on script heavy sites we noticed several design patterns that resulted in less than optimal script performance. Changing these design patterns on the site end often resulted in huge performance wins (4x to 10x increase) to the user, so I wanted to share these recommendations with everyone.

To that end, this blog will be the first in a 3 part series focusing on developing performance optimized scripts for web pages, covering the following:

1. Symbolic Look-up recommendations
2. JavaScript code inefficiencies
3. Script and performance considerations specific to IE