Ambient Occlusion (in other Viewers this includes light softening and SSAO) are the only available features that make the tiling obvious, especially light softening (smooth shadows) will show this a lot hence why you see it with Ambient Occlusion on without it you'll have to look very closely to find the tiling artifacts. It happens regardless of Ambient Occlusion and regardless of whether you can spot it or not as long as your snapshot is taken in resolutions even a single pixel higher than you
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