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Doom Graphics Performance Tweak Guide

By: Sean Ridgeley | Guides | Posted: Jul 1, 2016 1:10 am

Decal Quality


Alters the presence and quality of smaller details in a given scene, such as dirt, various patterns, and more.




No certain differences can be seen when moving from Low to Medium, but from Medium to High, we see the introduction of many details on the center bridge and the structure holding it up, as well as added grime on the left walkway structure. Ultra expands on this, adding more grime to the left structure, some on the center bridge, and some other indistinguishable details on the section far below the bridge, the distant room toward the right, among other areas.




Testing reveals no definitive impact on performance until Ultra is enabled, at which point a few frames are lost. Given the minor visual changes, changing this setting to High is recommended for most, as it grants an appreciable performance boost that's nearly free.




Decal Filtering


This option alters the fidelity of decals in the environment.




The screenshots show Decal Filtering has an extremely minimal impact on graphics. It's only really seen on the left walkway structure and even then differences are only really observed when switching from Trilinear to Anisotropic 2x, at which point fidelity of the grime increases slightly.




Coinciding with the screenshot comparison, the benchmark tells us Decal Filtering has no real effect on performance. Feel free to keep this setting at maximum for a free, very small visual upgrade.



Virtual Texturing Page Size


Adjusts the amount of memory your system uses for the id Tech 6 engine's virtual texturing system.



Testing tells us this setting has no concrete performance impact. Keep it at the default recommended setting for your system unless experiencing issues.



Reflections Quality


A normally innocuous enough setting, Reflections in Doom does a lot more than it lets on by its name, altering not just reflections but also lighting and shadows.




Disabling Reflections offers up a flat scene with minimal lighting and shadows; Low offers a massive improvement, with rich lighting and shadows seen throughout the scene, and reflections, most noticeably seen on the blood; Medium increases the quality of reflections and adds new ones (check out the right ceiling above Doomguy); High and Ultra offer a slight bump to reflection quality.




Testing says Reflections has a moderate performance impact as this setting is increased, particularly from Low to Medium or High. Set this to Low to save a few frames; otherwise, keep it at High.

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