There is described a method and a system including a viewing application running on a user's device configured to create a user interface including a drawable region on the user's device, a server environment including a coordinator engine to receive requests for review sessions from the viewing application, and a review helper process, allocated to each review session by the coordinator engine. The helper process retrieves medical study data from a data storage and transfers a stream of drawing commands to the viewing application. At least part of the drawing commands are cached on the user's device, so that the helper will not transfer the cached drawing commands again, and/or will transfer a drawing command relating only to a difference between one frame and the next.
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