Image upscaling typically requires more GPU than other image-processing tasks, and therefore it can take a bit longer time. Upscaling can take from milliseconds to minutes, depending on the upscaling method you choose (Upscale, Ultra Upscale or Ultra Enhance), the size, the upscale factor.
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When you try a typical representative image and confirm the process takes long for a synchronous processing, you can go after the Ultra Upscale which allows and asynchronous processing method.