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Doom Graphics Performance Tweak Guide

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

Window Mode


This lets you choose between the well-known fullscreen and windowed modes (the former better for performance, and the latter better for multitasking), or the somewhat less well known Fullscreen Borderless mode, which appears identical to Fullscreen, but allows for quick switching between the game and other tasks at the cost of game performance.




The benchmark shows no definitive change to maximum FPS when changing this setting, but does improve average and minimum FPS values slightly when changing from Borderless to Fullscreen or Window. To put it another way: Borderless will cost you a few frames at most.






The quality at which the scene is rendered, corresponding to the number of pixels; higher resolutions mean more pixels, which means higher quality.




Although difficult to compare 1366x768 to the other resolutions, comparing 1600x900 to 1920x1080 shows the latter features a considerably sharper image overall and much less aliasing. Pay particular attention to the 'Union' text on the left side as well as the left ledge.




The benchmark shows a major impact to framerate when increasing this setting, although usually only when moving from 1600x900 to 1366x768; not from 1920x1080 to 1600x900. In the latter case, only average FPS values change. As always, keeping this setting at the maximum is strongly recommended unless you absolutely can't avoid it, in which case 1366x768 is the way to go.





This ever important option controls the appearance of jagged edges (jaggies) seen on various surfaces throughout the game.




With no anti-aliasing, you can observe very distracting jaggies throughout the scene, particularly on the left ledge; FXAA reduces the edges considerably, albeit at the cost of some blur; SMAA gets rid of the blur but offers less coverage; TAA (1TX) offers slightly more coverage than SMAA and without the blur of FXAA, but introduces flatter shadows; FXAA (1TX) offers more coverage than TAA (1TX) but comes with even more blur than normal FXAA and keeps the flat shadows; again SMAA offers less coverage than FXAA in its 1TX form, but suffers blur (albeit less than with the previous setting) and flat shadows; TSSAA (8TX) brings by far the best coverage but also by far the most blur, and again features flat shadows.




Testing shows the different settings have a small and steady impact on maximum FPS from each setting to the next, with the exception of TSSAA (8TX) which actually works out a little better than SMAA (1TX); maximum and average FPS are affected little or not at all.


This means if you're struggling to hit 60FPS or perhaps you're aiming for 120, AA is definitely something you want to lower (consider FXAA or Off), while most everyone else should be able to pick whatever they prefer. I personally recommend SMAA: while the coverage isn't as complete as I might like, it's the most respectful of the options.



Motion Blur


This setting is always arduous to capture properly, and it's no different here, so screenshots are absent from this section. In-game, the implementation is very subtle.




The benchmark shows Motion Blur has a minor impact on framerate at the Medium and High settings; if you want to an extra frame or three, set it to Low or Off with little fear of visual impact.

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