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Can you please clarify your issue? Image streams are fed over mjpeg_server which is separate from rosbridge entirely. It runs independent of rosbridge and on a different port/protocol. Are you attempting to feed image streams over rosbridge?

Depending on how much data you are sending to the browser, this could also slow down the image processing as well inside of the browser.

Your example code also appears to be feeding in the image stream into a Kinetic object which is probably attempting to buffer your stream. This is the library doing this, not rosbridge.

As a side note, check out http://ros.org/wiki/mjpegcanvasjs for a JavaScript implementation to display mjpeg_server streams in a canvas.