The Gateway could certainly use some memory use tuning, to be sure. However, just because it jumped from 350 to 660 does not mean there is a memory leak. Also, just because it “stayed there” doesn’t indicate that there is a memory leak either. In fact, the only sure indicator of a memory leak is if it keeps increasing until it hits the max and you get OutOfMemory errors.
One question for you - what is the size of the [tt]settings.lobs[/tt] file inside your Ignition/contexts/main/db folder? It could be that by opening up the Designer and saving you’re triggering the auto-backup mechanism which is using a lot of memory (although this isn’t really something to worry about, just looking for an explanation). If your .lobs file is really big you should use the db compactor tool that we mentioned in the 7.1.0 release notes.
We will do some memory-use optimization on the Gateway on our side and see if there isn’t some grossly wasteful operation we’re doing that could be improved.