I have a 300/40 Mbps connection. For my main CloudDrive, that I store my active projects (Video, Photo) on, I have the following settings. These may not be optimal, because Google Drive limits the number of concurrent connections to 20, but this configuration can max out even a 1Gbps uplink. The prefetch trigger is something that you really need to set yourself. I work with large files and benefit greatly from prefetching, but your data might not.