Hi @PixelPopper,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
Since experiencing this have you tried rebooting your Core machine?
Can you provide some examples of searches that are going slow and about how many seconds it takes to load?