Does logging into Yahoo! Mail always take a long time? If so, it may be that caching is not enabled in your browser.

Here's how to fix it:

Internet Explorer 5.5 and up

• In the Tools menu, select Internet Options.
• Click the Advanced tab.
• Scroll down to the Security group and make sure that "Empty Temporary Internet Files folder when browser is closed" is NOT checked.
• Click the General tab.
• In the section labeled "Temporary Internet Files" ("Browsing History" in Internet Explorer 7), click Settings.
• Under "Check for newer versions of stored pages," select "Automatically".
• Under “Temporary Internet files folder”, in the "Amount of disk space to use" box, select 50MB or more.

Firefox 1.5 and up

• In the Tools menu, select Options.
• Select the Privacy icon, then click the Cache tab.
• Enter 50 (or more) as "disk space for the cache."
• Click Settings. If "Cache" is checked in the Private Data section, then make sure that "Clear private data when closing Firefox" is NOT checked in the Settings section.

Still taking a long time? You may be running 3rd-party software that empties your browser's cache after every use.