How can table scrollbars affect scalability and performance?

(by Mark Qian on 9/6/2006)

When talking about issues affecting scalability and performance, people always speak "big" like 
web framework and database. But do you realize that a very basic web component, table, may have a big 
impact on the scalability and preformance? When you read a web page, have you ever pay any attention 
to see if tables on the page have their own scrollbars (or frozen headers)? In other words, does the 
table header frozen when you scroll down? You may say, "What does that matter?". That does really matter 
if you care about the scalability, preformance and usability. 

I will illustrate three types of tables to see how their behavior impact scalability and performance.