Please be aware that many factors may affect the speed results.
Type of Router and Quality of WiFi
Depending on the type and age of your router this is the number one cause for degraded or incorrect speeds, DirectLink supports
a limited number of routers, choosing an unsupported brand may result in performance issues.
Concurrent Internet activity on your connection
If you have other applications, users, smart phones etc. consuming bandwidth this will affect the results.
The use of proxy servers and or VPN
If you are using, say, your corporate network at your place of work, there is a big chance that you are behind a proxy server. This, with NAT (network address translation), can affect the speed test results, because there are some special checks and additional activity at the proxy server.
Simultaneous tests being run on the same server
Obviously, the more there are speed tests being done on one server, the more jammed the connection to it is. As a result, test results will be affected.
PC Hardware and operating system
This can greatly affect results on a speed test. How old your PC is, what version of Operating system it runs, how much memory it has, what type of browser you are using etc.