Passing this on from a pilot at Avsim who posted this mod that reduces a rogue 8K Texture File in the VC Textures of the Fenix A320.
Re-size it from 8K (8192 x 8192) to 4K (4096 x 4096) using your image software to see an immediate improvement in VC FPS - did for me anyway.
Here’s the file you need to re-size (you can see I already did)
Here’s the thread that the guy posted on Avsim so credit to JYW for finding this.