“I’m currently working with QField + QField Cloud with multiple users on a cartography project that has three layers we update simultaneously. My question is that when we synchronize, the field app always downloads the entire map instead of only the layers that have been updated. This is inconvenient because, for example, the topography remains the same over time. Why doesn’t it only synchronize the layers that are edited and leave the others as they are? That way, it would download less data each time we sync.”
Moving question to QGIS US. I suspect you might have better luck getting an answer there.
kart may be worthwhile to checkout? It is a different workflow based around git, but that may get you the increase in performance you require.