I noticed this today and thought I had an issue with the game I am making, but even when I create a new place in studio with just a baseplate, if I launch the game through the roblox website and open the dev console, Client Memory/Place Memory/LuaHeap is rising constantly, at a rate of about 2.3 (meg?) every 10 minutes. When I start the empty place, LuaHeap is 4.2, and after 20 minutes it's up to 8.7 and constantly rising.
Does anyone know why this is? Is the roblox client leaking memory?