EXPERT RESPONSE
Since your performance appears to be related to the time of day, it is likely due to congestion points in the network. One possibility is that you may be suffering from congestion on the link over the Atlantic. Depending on your Internet provider's peers, the trans-Atlantic connections can be undersized for peak usage, particularly during US business hours. This can result in high latency and packet loss, and a corresponding drop in throughput. You could confirm this by testing your performance outside of the VPN during the slow times, from a server located in France.
Another issue could be the number of users on the host site concentrator. Congestion on this server could also result in slower user performance. You can confirm the concentrator load by examining its logs for the number of concurrent users during the slow performance period. Your VPN provider should be able to provide guidance on whether this number is within the specifications for the concentrator capacity.
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