Plex Cover artwork is Slow to Populate on Client

Hello- I am currently testing out 3 different seedboxed, and Seedboxes.cc is in fist place so far lol. The only issue I have run into, is the Plex Cover Artwork, loads very slow as compared to the other the services and obviously way slow versus when I host locally. I do not believe Internet speed is the issue. Can We move the metadata? Any other suggested to speed this up?