You may experience a slow performance using visitor maps due to the following reasons:
- Your Internet connection is not broadband or has issues. You can find a broadband speed test and run it to troubleshoot a slow internet connection
- Your computer's CPU or memory is used by another program, which does not manage a cache properly. Restart your computer and see if the performance is improved
- If you are using Internet Explorer 6, Google Maps API has an issue with this version of Internet Explorer. With each map viewing, Internet Explorer doesn't purge the memory cache properly, causing the gradual slowdown and finally a complete halt while displaying the maps. In this case, a different browser or a newer version of Internet Explorer should be used