This engine is not optimised for performance. It's using CSS, after all.

Yeah this is a case of “not the right tool for the job”.

It is awesome though.

Of course, but you'd think after 30 years the compute power should be enough to overcome any lack of optimization. It's a testament to the engineering that went into the original Quake engine.

Decades of optimizing a toaster to make better toast will not make the toaster any better at making meatloaf

Is this the right analogy? The product is the same, the appliance is different.

It should be "Decades of inventions from toasters to IOT AI Smart Air Fryers will not make better toast than the original"

But I'd argue the IOT AI Smart Air Fryer should make really good toast. Which is what GP is saying.

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I am on the ground. This is great.

Still, why css is as slow as it is given what tech like imgui can do is a little wild.

CSS is a general rendering solution, not something built for rendering 3D games.

And no one has spent any time optimizing 3D transforms to make a game workable because no one would be able to justify the use of their time like that. It wouldn’t even give you brownie points ‘cause most people would just ask “why?”

Id assume "a fun challenge" could be enough of a reason