Flux Dev itself can also be used for Upscale, bringing improvements in image quality and details.

Even when using the Tiled method for enhancement, the boundaries are not obvious, No need for seam-fix. This workflow is used to study the performance of Flux in enhancing image quality.

On a local machine, generating an image with Upscale using an RTX 4070 takes approximately 458 seconds and image upscale 2048 to 4096 (Slice into 4*4) takes almost 1200 seconds.