For stress testing, stress-ng might be worth considering.
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There's mprime/gimps which is a bit older, but works well enough for CPU/RAM stress testing.
Superposition is too big in size
Blender can be benchmarked, although I'm not sure if you can benchmark the quite recent Vulkan renderer.
There's also vkmark although it looks pretty simple (at least the 2017 version in nixpkgs).
s-tui can be used to stress stest the cpu and monitor cores and core temps
For a system level stress that hits cpu and memory hard, get the kernel, unpack, then
while make mrproper && make defconfig && make -j vmlinux && make -j modules; do date >> last_build.log; done