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In #VideoGames, we're all familiar with display engines struggling to render complex scenes, leading to stuttering or lower frame rate. I'm curious about the opposite, cases where the simulation itself is struggling but the rendering done in parallel is just fine? Video examples appreciated.
@Hypolite Petovan Dwarf Fortress and Factorio both do this to me reguarely
In the main title I am working on, the world is generated in the background as you play the introduction/tutorial.

This sometime make the title run slowly with some hitches although there is nothing hard to render.
This was pretty common with complex physics before we found ways to push most of that to graphics cards. IIRC, Mirror's Edge had some early levels with shattering glass that pinned the CPU. It really wasn't that different from GPU lag, except that it was very erratic (mostly things are fine, sometimes it took whole seconds to render a single frame).