I just tested on Mac OS X ... presumably Windows will behave similarly...
If I simply rename the CineRender folder (inside the ArchiCAD 18 app folder) - then CineRender does not launch. Attempting to use it will give odd results. E.g., the render settings preview window just spins indefinitely - but using Internal or Sketch behave as expected.
70 MB of memory is absolutely nothing these days though - cannot have any meaningful impact on your computer whatsoever.
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB