PythonSlotWindow.cpp
If you have ENABLE_HIGHLIGHT_SYSTEM then search for:
pEff->SetRenderingMode(CGraphicExpandedImageInstance::RENDERING_MODE_SCREEN);
And add under:
pEff->SetDelay(your_value_here);
If you don't have ENABLE_HIGHLIGHT_SYSTEM then search for:
m_pSlotActiveEffect->SetRenderingMode(CGraphicExpandedImageInstance::RENDERING_MODE_SCREEN);
And add under:
m_pSlotActiveEffect->SetDelay(your_value_here);