Charles, that you can minimize with faster (wired) Internet connection and more powerful device. Even if you do your part to cut that loading time to the minimum, you cannot control the server/hosting of each website you are trying to get uploaded to your device. The website itself may have elements that would make any browser to sweat bullets before uploading it. In short, it is a complex issue.
Charles, another idea...please re-add your Video Widget so that it is the latest Rise Vision Web Page Widget. Then remember to set your Refresh Interval to 60 minutes to experience the smoothest playback, with occasional reloads.