If it's working, you wouldn't see anything.
Under load or sometimes randomly, folks would see:
stream error: stream ID 57; INTERNAL_ERROR
In your rclone logs and stuff would lock up (for me anyway) and things would basically go very bad from that point as IO would get hung and never return.
If things are working, you really should not see much difference. You may want to check for better performance as you were trying to throttle things before. HTTP2 should be faster/more efficient than HTTP.