Even without a graphics mod, Thief 2014 is a game that can look extremely good, mostly because it has a unique art style.
These graphic tweaks can help you to play the latest Thief, 2014, with a decent amount of FPS while at the same time, getting some of the best graphics.
From the Thief 2014 launcher:
Default maximum resolution.
Vsync: double buffer.
The options from the “graphics” tab are the same with the in-game ones.
Don’t bother adjusting them.
From in-game
Field of view: 90.
Preset: custom.
Texture quality: normal.
Texture filtering quality: default.
Shadow quality: low (important option).
Screenspace reflection: ON (if you see transparent or matte windows).
Depth-of-field quality: normal.
Parallax occlusion mapping: OFF.
SSAA: OFF.
FXAA: OFF.
Contact hardening shadows: OFF.
Tessellation: ON.
With these settings, I get 35-40 FPS which is pretty decent.
My configuration: Intel I3 3GHz, 8 gigabytes RAM, ATI Radeon HD 5670 (1 GB RAM).
How is the game working out for you?
In 2021, this game should run without any issues on any modern computer, with a graphic card with at least 4GB RAM.
Even though it is an old game, the graphics and the gameplay are still making it worth to be played nowadays.