This is a clever prompt. "Rendering thread exception" in Batman: Arkham City (and other Unreal Engine 3 games of that era) is a notorious crash error, usually related to DX11, tessellation, or PhysX conflicts.
"Arkham City DX11 Fix"
If that fails? There is the nuclear option: Download the mod from the community. Some brilliant modder decompiled the shader cache and removed the specific draw calls that caused the memory leak.
A Rendering Thread Exception occurs when the game's rendering thread encounters an error, causing the game to crash or become unresponsive. The rendering thread is responsible for handling graphics rendering, lighting, and other visual effects in the game. When this thread encounters an issue, it can lead to a crash or freeze.
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Causes of the Rendering Thread Exception
A. The GPU Clock Instability