Having become disappointed with the slow response of the WSPR map which was taking over a minute to fully complete when using Firefox I wondered whether the Google Earth data might be slowed due to low priority at busy times. I therefore tried the Google Chrome browser. The speed was 5 to 10 times faster in map and full data rendition. I don't know the downside of Chrome but for WSPR purposes it is superb compared to Firefox. To get the best data on the maps I reduced the Chrome default font size by two sizes, and then zoom up the complete map and content by one Cont ++.