For some reason this plugin isn't available.
LINK
https://www.spigotmc.org/resources/keepchunks.23307/
DESCRIPTION: KeepChunks allows you to select chunks to keep them loaded in the Minecraft server memory, even when there are no players around. This can be useful for large redstone circuits, minecart railroads, commandblock systems and even for reducing teleport lag.
Thank You
