Let me share my current misery with you all.
View attachment 137814
View attachment 137816
Some context. We're at our house in France and as expected the landline phone and internet are not working (another story) and as a partial stopgap until the line is fixed have lent us a 4G wifi modem. They have lent us one of these before and we had a download speed of about 8 Mbps, about 4 times our normal landline speed but as you can see there's something seriously wrong. On the first screenshot the upload speed is so low it can't be measured! Slightly better on the second one but still crap.
I took the 4G modem back as faulty but of course it behaved perfectly in the shop. It gives better performance from time to time, usually after being left alone overnight. Come back a working landline!