Even fast connections suffer from multiple HTTP request overhead because of network latency and HTTP request processing overhead.
MSIE7 opens no more than 2 connections per domain, Firefox3 – 4-6 connections, Google Chrome – 6 connections.
Let’s suppose that time to first byte is 70ms (typical response time of http://google.com via 1.5 Mbps ADSL connection from Dulles)
If a page view involves loading of 20 images from the same domain, then total overhead in MSIE7 is 20/2*70ms = 700ms. The more images site contains, the more time visitor will have to wait.

The popular solution is to use CSS Image Sprites:
Join design/logo images into one bigger image. Use spriting technique (css background) to show the images on page. An image can be defined via css property background-position.
This approach is compatible with modern browsers (and even with IE4).

Let’s review the process step by step:
Step1.
Replace image entries with