I don't know, maybe this is not an issue, but I was surprised when noticed this
I opened sample model duck (File -> Sample scenes -> duck)
Chose export (Tools -> Export)
File Format: Stanford Polygon Library (binary) (ply)
check "Open exported file in viewer"
set Path
pushed export button
https://youtu.be/2UxmJyrkvO4
Result: Free RAM memory became rapidly decrease
Also I checked other samples and only spider gave same effect, but free RAM space does not ended
Tested on Windows 7 x64
I don't know, maybe this is not an issue, but I was surprised when noticed this