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The amount of bandwidth that GoToWebinar uses during a session will vary depending on the features that are being used. For example, screen sharing will use more bandwidth during a PowerPoint presentation with multiple slide changes than it will when a single image is being shown. Also see How do I speed up my internet connection?
In general, you can estimate the amount of bandwidth a session will require using these data-usage averages:
In general, it's recommended that you have at least 1 Mbps of bandwidth available if you plan to use all 3 of those features during a session. Less bandwidth will still work, but the session performance may suffer because of it. More bandwidth will provide a superior experience.
Note: This is based on the ISP unit measurement standard for Data Transfer Rates (Bits). This is not to be confused with the unit measurement standard for Data File Size (Bytes). 8 Bits = approx. 1 Byte