I need to seek some advice from the gurus here:-

1) What are the benefits of using the new XHTML 1.0 compared to HTML 4.01 specification? Currently my website is using HTML 4.01 Transitional doctype. Will it affect the current site layout if I change to XHTML 1.0? Does this new format supports the older browsers like Netscape 2 and IE 3.02?

2) As we all know, there are two ways we can implement the CSS on a website. There are Inline CSS and External CSS methods.
Some people claimed the Inline CSS will process faster as the codes are embedded into the HTML codes itself. Is it true? Also, is there any impact on the page size?

Your comments are very much appreciated. Thank you.