...seems... ...probably... ...suspect...

3dlight has been so abandoned by DAZ that the 4.8 build includes a recent and significantly faster version w.r.t. 4.7. Give it a try.

While we are in the real try vs. bitching upon hypothesis subject, I suggest you to explore for real how Iray and G3 work on your box. On my six years old workhorse main computer they work pleasantly, on my lowly 500 euro notebook with an entry level NVIDIA card even better.