It's because of the inner workings of the Render-Queue.
Everytime you add a project into the render-queue, Reaper creates a rpp-projectfile of the state the project is currently in at that time of adding it.
It will store this projectfile in the resource-folder/QueuedRenders.
When you execute the render-queue, Reaper loads these projectfiles, one after another, and renders them out.
And that is, why it opens a new project-tab, as it loads a project into that(and consequentially needs to load its plugins as well).
So if you want to have faster render-times, you should render the project, when it's still opened.
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