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I just released a new library called Large Sketch Viewer. It allows you to work on large resolution sketches, from small resolution laptops by creating a smaller preview of your Sketch. It doesn't change your original sketch, so when you are ready to display your Sketch on a large projector or monitor you just need to delete the library initialization line.
This library should be useful when you are developing a Sketch for a large screen or for a high resolution image export.
I have only tested this so far on a Mac. Any thoughts or questions would be appreciated.