Graph view stops re-rendering about 1 second after nothing has changed - That includes zooming, panning and dragging nodes around.
For me at least, the CPU and GPU usage stops. If it doesn’t for you, can you open the developer tools and take a performance sample for 2 seconds.
Here’s what mine looks like: You can see at the beginning, after I dragged the graph, it renders for about 1 second, the graph on top has many yellow peaks. Then it stops the graph becomes flat at the bottom.
I see the same thing. About 10% cpu usage by Obisidian Helper (GPU). Th graph view is shown in one of the panes (1/4 window) but no other interaction. 5 year old MBP, running Mojave & Obsidian 0.7.3. 133 .md files. The usage goes down as soon as I switch away from the graph view. I didn’t do anything more than clicking on cmd-G. No zooming/panning either.