It looks like your wifi might have become slow for some reason? To check goto a speedtester site like https://www.speedtest.net/ to see how fast it is compared to what it should be.
Too confirm it's the wifi if you have a network cable plug one end into the laptop and the other into a spare socket in the back of the router. After a minute the wifi icon on your laptop should disappear and be replaced a network icon (usually some kind of small square) Try the laptop again - both TNT and Speedtest and things should be better - hopefully!
If that all works out and you've confirmed it's a wifi issue I would reboot the router. Turn if off, wait 30 seconds, turn it back, wait a few minuites for everything to reconnect and check again (rememeber to remove the cable from your laptop to re-enable its wifi!)
Or just jump to my 3rd paragraph and reboot the wifi anyway! I would also restart the laptop - not "shut down" which doesn't actually shut a windows laptop, (don't ask!) by selecting restarting from the start menu. My old laptop's wifi would stop working randomly until I restarted windows
There's a reason for old IT joke "Have you tried turning it on and off?"
