Seems like you are mixing speeds measured in bits/second (b/s) and bytes/second (B/s) - the difference is roughly a factor 10 (including overheads).
I guess the speed of your VPN is 700M bits/second - that is app. 70M Byte/second.
rclone displays speeds in Mbyte/second.
Google has limited CPU and network capacity like anybody else and therefore sometimes limit your downloads to share capacity fairly between their customers. Your Google downloads may therefore (in periods) be slower that your speed of your network connection.
It is my experience that rclone downloads are just as fast as a download from the Google Drive website - no worse no better.
This post has a few tips to get good speeds from Google:
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