How can I test
Use a route tracing utility, such as Trace Route, to determine where problems are exist between your computer and the WebEx servers. These utilities send data from your computer and measures the time it takes to for the packets to reach the WebEx server. Ideally, packets should take between 1-60 ms to reach the server. If they take between 60-100 ms, your connection is slow; times longer than 100 ms are unacceptably slow. If you continue to experience poor performance, contact your network administrator.
To run Trace Route on Windows, open a command prompt and then enter "tracert your_site_URL" (where "your_site_URL" is the address of your WebEx service site). Make sure that you place a space after "tracert".