When using the VFS cache set to either writes or full I’m able (by appropriately using --drive-chunk-size and --transfers) to reach over 500mbps upload to Google Drive (with a 1gbps NIC).
However, when disabling the VFS cache or setting it to minimal my uploading is limited to around 200mbps, seemingly regardless of the values of --drive-chunk-size and --transfers.
The above scenario is consistent. Is this expected behaviour? If not, how can I debug this?