There’s some strange things going on in DOOM Eternal’s code. Strange, demonic things.

If you take a peek under the hood of DOOM Eternal, don’t be too surprised to see some things that aren’t like any other game on the market. No, you won’t find demon imps flinging fireballs, but you might find some things that you’ve never seen before in a video game.

Last week, id Software programmer Axel Gneiting took to Twitter to boast a bit about what makes DOOM Eternal such a technically incredible game. Anyone who’s played it will find that it recaptures the smooth framerate and ultra-fast action that the 2016 DOOM did, and even improves upon it.

There’s a few reasons for that, and the first has to do with how DOOM Eternal manages its processors.

“Fun fact: DOOM Eternal does not have a main or render thread,” Gneiting wrote on Twitter. “It’s all jobs with one worker thread per core.”

Although CPUs and GPUs have had multiple “cores” for some time now, PC games still tended to use just one of those cores at any given time. The latest generation of games–of which DOOM Eternal is obviously a part of–make full use of processors and use as many cores as they can, distributing tasks amongst them in the most efficient way possible.

Tiago Sousa, another id Software programmer, took to Twitter to tout DOOM Eternal’s incredible anti-aliasing. “Anti-Aliasing uses up to 32 temporal subsamples (~32x SSAA). This iteration is also full quality on all platforms due to heavy optimization (0.92ms on XB1 and runs async).”

We’re not going to pretend to know what any of that even means, but we can say that this is one of the few games where anti-aliasing actually improves framerate rather than taking away from it.

Sousa also said that DOOM Eternal uses texture streaming instead of mega texture packs in order to keep memory usage to a minimum. Texture streaming is when textures are loaded into GPU memory only as the player views objects. This can lead to the phenomenon known as “texture pop-in,” but DOOM Eternal is so well optimized that texture pop-in is almost nonexistent.

All of this is to say that DOOM Eternal is an incredible graphical achievement and you should play it when you have the chance.

Source: Twitter, DSOGaming