Thanks to SR of http://www.cheapps.org for a performance tip: Turn off visbility on the bottom textarea field before Geocoding begins to speed things up.
Before Firefox 2.0 I didn’t find a big performance difference with updating the TextArea field in real-time and displaying it. Looked “cool” to me so I kept it. But when Firefox 2 came out they added a spell check feature to all textarea fields and the spellcheck process seems to slowdown writes to the textarea field when a lot of data is used.
Anyway, thanks for the tip!