I do use WHDload often, but not all games and demos exist under WHDload in a fashion that runs them perfectly smoothly as intended, as I described.
And in some cases, WHDload introduces slow downs. See my Zeewolf 2 video showing this: https://youtu.be/gXs0AX9LlEI
bp
You tried WHDload Wrapper? in my experience, anything that had issues or never worked. Instantly were sorted by using this.