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There are some things to consider besides resolution, for instance the AE,E, and D dims. IF these are higher then it will take a more powerful GPU / longer time to train. Keep in mind that going from 128 to 192 is already a 50% increase in resolution which will translate to significantly more VRAM usage.
Also I’m not sure about the effect of enabling AdaBelief after pretraining. I think the model will need to adapt, therefore needing more training time. You might try continuing pretraining with AdaBelief enabled before using the model to see if that gives a better result.