Slow Appearance of Hover Text

I've created hover text boxes (I don't know what the real name is for these
things) using TITLE attribute in the IMG tags on my website (see my site link
below) , but in Firefox 2.0.0.15 the title hover box takes a long time to
eventually appear when holding the mouse over the thumbnails.

In Safari 3.1.1 the boxes appear much quicker.

I'm using a G5 PowerPC, Dreamweaver MX.

Is there a way to speed up the appearance of those descriptive text boxes?

Many thanks in advance.

Zina
http://www.zinasaunders.com