Very nice read. Jeff talks about the points that can really help.
Here is an excerpt on the points he discusses:
1. Switch to an external image provider.
2. Turn on HTTP compression.
3. Outsource Your RSS feeds.
After implementing all these changes, I'm very happy with the results. I see a considerable improvement in bandwidth usage, and my page load times have never been snappier. But, these suggestions aren't a panacea. Even the most minimal, hyper-optimized compressed text content can saturate a 300 KB/sec link if the hits per second are coming fast enough.
Read the whole story here at Jeff's blog Coding Horror