@keithcurtis I think you are on to something with the character sheet for 5e. Here's some additional information (I'll cross post so that this gets into other folks hands too).
1. I finally got my 5E game to open on Chrome. As it did that I was watching my system performance, and chrome's memory consumption jumped through the roof. It was spiking as high as 3GB of RAM used and power consumption was VERY HIGH.
2. Once the game finished loading, and I could interact with maps and tokens, memory consumptions dropped to about 1.5GB. Still extremely high in my estimate, but much lower than at load time.
3. When I was in that game, every time I messed with a character sheet processor load, memory and power use all spiked. Memory in particular went up by more than 50% (measured from the 1.5gb steady state baseline) to like 2.25GB for a short period of time (like 15 seconds)
4. When I opened another game using the AGE system (so no 5E character sheets) the load time was faster, and memory usage was much lower. Stable at about 900 mb of memory after the initial load.