Hollywood FX uses older GPU technology. If you experience lag: Go to the Hollywood FX setup options. Disable "Host Video Preview" if available. Lower the preview resolution within the HFX editor window. Conclusion

Look for a file named HfxEdt5.vfx or similar (part of the PVS package).

Run the Hollywood FX installer (often version 4.6, 5.0, or 6.0 depending on your package).