Trying to improve performance of the game I turned off dynamic lights*. This led to desired effect; however, this also removed the most of the textures of weapons and items in the inventory menu:

and on the loading screens:

making the gameplay less enjoyable.
Is there any way to turn off dynamic lighting while preserving the textures of weapons and items in the inventory menu and on the loading screens?
_______
* C:\Users\%USERNAME%\Documents\My Games\Borderlands 2\WillowGame\Config\WillowEngine.ini → [SystemSettings] → DynamicLights=False