Probably some Extensions are slowing down the speed test process. Use Safari or Chrome in Private Window or Incognito Window.
You can delete your browser cache by pressing Ctrl+Shift+Delete. And try again.
Issues found with various mobile web browsers that Enabled "Data Saving". Specifically this issue found on Dolphin(Cloud Acceleration), Opera(Off-Road Mode). You can Turn OFF this feature to get accurate upload speed.
Your final results depending on many factors, including the traffic currently handled by our server, application that consuming bandwidth on your system, connectivity issue with international server with your isp etc. Better try after some time. Issue primarily due to the connection issue with your ISP.
Most of the time slow internet speed you feel because of poor optimizations at your side . Some simple optimization can improve your broadband speed ! if you follow them you can increase your internet speed . Yes can increase your Internet speed by 50% even 150% but How ?