We provide the maximum possible connection speed for the current conditions.
However, the conditions for your connection may vary because of the current workload on the selected server and the distance from you to the selected VPN server.
Also, there is always a chance of slowdown because of your ISP throttling VPN protocols. We cannot control these circumstances.
So, as a suggestion, try to connect to several servers that are geographically closer to you, and check the performance.