I had some issues with sending data in v2.x of Tauri. Using anything other than Resulttauri::ipc::Response results in hardly 1mb/s and the said method gives around 225 mbps. Many other users see varied speeds. The only conclusion one can come to is that it is hardware dependent.
This repo contains an implementation of a stream of data that is being sent to the frontend. I was dealing with video streaming, so there is an implementation of JPEG-style images. They cannot be rendered.
This issue and discussion will help you guide. Official documentation is lacking currently (as of Oct 2025).