Estimating of remote numbers of files and size of files takes time. My experience of rclone is still very limited and it might be some parameters to set for speed up the estimating.
If view is closed and opened again RcloneOSX loads previous estimations.
User config and version 1.43 or newer of rclone.
Notifications and log
RcloneOSX issues a notification every time a scheduled task is executed.