Guitar Hero Metallica Issue

Hi there, I'm having problems running the Guitar Hero games. Rock Band games works really fine but Guitar Hero Metallica, Van Halen, Warriors of Rock and 5 gives me lag. I don't know if this is an audio issue or a gpu issue because I disable the audio out and the game works fine (except for the flickering) but it runs smoothly. Also, this issue happens when I enter in a song the game starts lagging but when I hit restart the game runs the song almost perfectly until I hit the star power and the game starts to lag again. I don't know if it's because my processor can't run this games. But if there's a fix please tell me.

These are my specs:
Processor: Intel Core i7-3770k 3.50GHz
RAM: 16GB
GPU: Radeon ™ RX 470 Graphics

Hi , Try these optimal settings for guitar hero games ( It runs at 60 fps all the time !)

CPU
-PPU Decoder: Recompiler LLVM
-SPU Decoder: Recompiler LLVM
-Lower SPU Thread Priority
-SPU cache
-SPU Block Size: Safe
-Preferred SPU threads: 3 [[or 5]]
GPU
-Vulkan
-Resolution: 1280x720
-Framelimit : Off [[or 60]]
-Anisotropic Filter: Auto
-Anti-Aliasing: Auto
-Resolution Scale : 100% (1280x720)
-Write Color Buffer: on
-Vsync: on
-Shader Mode: Async
Advanced
-Sleep Timers Accuracy: As Host
-Maximum Numbers Of SPURS Threads: 3 [[or 5]]
After That, Everything As Default

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==Avoid flickering (maybe fps drop?)=====
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Advanced | GPU

Read depth buffers : On
Write depth buffers : On