Hey, so this problem may be a bit niche. The way I'm using Productions is to basically group footage and assets by certain clients. I now have clients where the Production has grown quite large. Think multiple years of footage, hundreds of thousands of files in almost 400 prproj files in that one Production. It sounds a bit insane, but it works really well for finding old clips for reuse. 
So I decided to convert one of those monster productions to the new 25.6.0 format, and although my machine has 128GB of RAM it kept crashing the system hard. So I found out the conversion needs more memory...a lot of memory. After settings up a pagefile large enough the conversion used about 350GB of sytem memory at peak, and it took about 4 hours to convert. (Screenshot below, that wasn't the peak though...)
 
So project version upgrades are not happening often, but if they do it's "a thing" for me. I'm not saying this is a high priority, but if someone could make the conversion process a bit more intelligent that would be ace. I can't really see how the conversion should take 350GB of RAM or take multiple hours. 🙂
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