I started noticing a problem in the past few days where doing nearly anything in layout mode in FMPA was sluggish: clicking from object A to objectB would take .5 - 1 second to register; clicking into a text object would take similar amounts of time; double clicking buttons to open the definition window, etc. It doesn't seem like much time, but it is extremely noticeable and has a significant impact to my workflow. I have to click - pause - click pause - click...
I do tend to leave FMP up and running all the time. So I checked on my Activity Monitor and FMPA process was sucking up 7.25GB of memory! And this was after I had closed all of my open files. (See screenshot - shows the 'Window' menu with nothing visible, and the Activity Monitor stat line.) So I would guess it is a memory and swapping issue (I have 8GB of system RAM).
OS X 10.11.6
8GB RAM (so FM pretty much is taking up the whole thing)
4 plugins installed (2emp family, 2emp Dev Asst, BaseElements, custom plugin); only BE and the custom plugin are enabled.
I closed and restarted FM, then opened the two files that I normally have open. FM is using up only 310MB of memory now (0 compressed). Maybe this same memory hog-i-ness is causing the weird blank-row-when-scrolling issue I have seen in one of my files.