Blank Spaces in Graphs

Can anyone here tell me why my graphs have these blank spaces in them? I feel like I need to “tune” my server however, I don’t have the first clue on how to go about doing so and I’ve looked over the documentation on performance tuning…, anyone have some suggestions for me?

https://docs.librenms.org/#Support/FAQ/#faq17
and
https://docs.librenms.org/#Support/Performance/