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It depends on your target hardware. In my testing, ShadowEngine v3 runs a little faster than the stock CopperCube realtime shadows. That's mostly due to heavily reduced CPU usage, as ShadowEngine doesn't parse all visible scene nodes each frame like the stock behavior did. Additionally, ShadowEngine v3 required I partially ported CopperCube to Pixel Shader 3.0, which improves performance too. 

However, I'm developing this on a dual RTX 3090 workstation with Ryzen 7950X CPU. In my testing on a much older system (Intel i5 7500T with integrated graphics), performance was marginally worse than the original shadow implementation. On that system, my test scene with 600,000 polygons ran at 27fps with ShadowSystem v3, and 29fps with default shadows. The limitation will ultimately be GPU memory bandwidth due to the much heavier PCF-filtered shader.