How much memory do you have allocated for other programs, like your operating system?
Check the renderer setting in the composition settings, generally Ray-Traced 3d make the After Effects preview slow and play back only few frames, if the adaptive preview is off and resolution is set to full.
The allocated memory for AE: 6.3GB, other programs: 2GB. I did not change any settings.
I checked the renderer setting and the renderer is set to "Classic 3D" not "Ray-Traced 3D".
I tried to create the same type of sequence with Multiple video files and audio on both mac and windows...but it seems to work fine in AE CC 2017.1.2 v188.8.131.52.
Did you try deleting the empty disk cache and clean database cache after closing the current open project and also try files > Dependencies > collect files .
Are you still facing this problem? If not, let us know how you solved it. If so, please let us know so we can assist you further.