id Tech 7 features ten times the geometric detail of id Tech 6 and higher texture fidelity. Moreover the capabilities of the game engine allow it to have a new system called "Destructible Demons", in which enemies' bodies become progressively destroyed and deteriorate in combat as they suffer damage. On PC, id Tech 7 supports Vulkan rendering only. Ray tracing and DLSS were added in June 2021. According to engine developer Axel Gneiting, the engine doesn't have a "main thread"; everything is implemented as jobs.
Improvements in comparison to id Tech 6
1 million fewer lines of code, due in part to the removal of the OpenGL render-engine
Full HDR support on PS4, PS4 Pro, PS5, Xbox One S, Xbox One X, Xbox Series S, Xbox Series X, PC and Stadia
Multi PBR material compositing, blending, and painting
Increased texture fidelity and geometric detail due to removal of MegaTexture pipeline, used since id Tech 4
Enhanced global illumination quality
Greatly improved particle system as more particles are running on the GPU, which allows for bigger explosions, more atmospheric volumetrics and more vibrant particle effects
The framerate limit has been increased to 1000 FPS. The frame limit was 250 FPS in id Tech 6.
Rewritten jobs-system to use all available CPU cores more efficiently
Improved post-processing effects, including more detailed anti-aliasing and enhanced motion blur
Support for gameplay areas twice the size of those in id Tech 6