I want to point out that the exact same effect occurs when any complex object enters into range of a light source. In my case, the character is a very complex object.
For example, in the spaceship corridor, as in this test, the light sources have a short range. As the character walks through the corridor, they are affected by a whole chain of light sources, which significantly slows down gameplay. Although, as I’ve already discovered, in such small location, the problem can be solved by increasing the range of all sources, say, to 150.
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