@lhari84 ES issues regarding picture resolutions are related to the GPU memory which is limited to less than 512Mb whether you have 1, 2, 4 or even 8Gb on the board. That's why we say that running Recalbox on more than 2Gb is useless.
Nevertheless, we're already working on the FrontEnd to rewrite all the picture management code, but it's a long and hard task, don't expect changes in the next weeks.