I have the same problem when using nssm to mount rclone as a service, but digging around the forum I found @thestigma has shared a much better way. Using a batch script with
rclone rc vfs/refresh --fast-list recursive=true
cuts the wait down to 10-12 seconds. Disable real time protection and everything opens in 4-5 seconds.
You can find the script here and adjust it to your liking:
Plex is miles better without the need for cache. Life is good. Thank you @thestigma