beta 1.8 consuming 1.3GB of memory in fs mode

See attached screenshot. I’m guessing using this much memory isn’t intended? This machine has enough memory to handle it, but it also seems to coincide with sluggish performance. The memory jumps up when I enter fullscreen mode (doubles from about 600MB to 1.3GB) then goes back down again when I exit fullscreen. The larger problem is that I can only repeat this about twice before Scrivener crashes. In other words, I can crash Scrivener without fail just by popping in and out of fs mode a few times.
scrivener memory usage.PNG