50 Web design tips to Speed Up Site

There are all sorts of tips and tools included, from reducing the number of HTTP requests to compressing images and playing with caches. Here are six articles that I wrote on the topic some time ago (they were included on the list) :

1. Speed Up Your Site: Optimize Images
2. Speed Up Your Site: Image Formats
3. Speed Up Your Site: Optimize your CSS
4. Speed Up Your Site: Use a slash on your links
5. Speed Up Your Site: Use the height and width tags
6. Speed Up Your Site: Reduce the HTTP Requests

Source : 50 Tips to Speed Up Your Website