Long Term Load 10.9<4

Hi All,
I have Pihole set up in a docker on Synology, whenever I switch the router to go through the pi-hole I get this error. When Looking through the Synology Resource Monitor it shows roughly 20MB/s on network less than a quarter of what's available, 37% CPU, 60% memory and 30MB/s on Volume (On Docker it shows 45% CPU and 50% RAM of which pi-hole is using 0% CPU and 12 MB Ram)

please see token below:

Hope i've given correct info.
Thanks in advance