[Request] GGG Development Post: Why does POE1 not use up lots of GPU VRAM/damanding on the CPU?

Would love to read a GGG Development post explaining their custome in-house engine (and ancient design decision):

Why does POE1 not use up lots of GPU VRAM, compared to other game engines. And why is POE1 so CPU heavy?

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Why does POE1 not use up lots of GPU VRAM

PoE is a isometric game. You only see what you need to see. A GPUs VRAM holds data like 3D models (meshes), high-resolution textures, framebuffers, shaders, and lighting/ray-tracing data. Due to its isometric nature and thanks to optimizations like texture compression, games like PoE typically aren't that VRAM hungry.

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And why is POE1 so CPU heavy?

A metric fuckton of interactions and calculations that are all happening (almost) at the same time while communicating with the server.