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Installation

Download the Release.zip file from https://github.com/yamashi/PerformanceOverhaulCyberpunk/releases/latest
Unzip everything in <cyberpunk install path>/bin/x64/
You should see Cyberpunk2077.exe and version.dll in this directory, it means you did it correctly.
Launch the game!
(Optional) To check that everything works you can look at the logs in <cyberpunk install path>/bin/x64/performance_overhaul/performance_overhaul.log

Three options:

You modified the exe yourself, in which case the mod will not work! You can repair via GOG or Steam to revert your changes.
You are using a patch that is not supported (currently only 1.04 is supported for some patches).
You used the old version of the mod and still have the old file, delete bin/x64/Cyberpunk77.exe.plugins/ and reinstall the mod.

Install this

Boolean options set to true means that you enable the patch!

avx: Some people encounter a crash due to AVX, if you encounter the crash, set this to true. (default: false)
smt: This fixes a bug with AMD CPUs causing the game to use only half the CPU. (default: true)
spectre: Spectre is a hardware security flaw that can leak a process' memory, the mitigation for spectre has a performance impact. The mitigation doesn't make sense for a game, a spectre exploit is very hard to pull off and there is nothing in Cyberpunk's memory that is sensitive. This patch removes part of the mitigation to get back that lost performance. (default: true).
virtual_input: Not performance related, fixes the input so you can use Steam controllers. (default: true)
memory_pool: This will override the default memory pool settings, it gives a decent boost of performance for some users and none for others. (default: true)
unlock_menu: Unlocks the debug menu, use at your own risk! (default: false)
cpu_memory_pool_fraction: This gives the percentage of CPU memory to use, 1.0 being 100%, 0.5 being 50%. (default: 0.5)
gpu_memory_pool_fraction: This gives the percentage of GPU memory to use, 1.0 being 100%, 0.5 being 50%. (default: 1.0)