Poor performance with portable wifi hot spot. Is this normal?
In theory you should get full speed but this things can be dodgy sometimes. Make sure you make these speedtests at the same spot and at the same time to avoid congestion and diffrent signal strenghts effecting the test.

You can try USB tethering and see if the speed improves. If you can't find usb tethering in settings there are apps that should allow you to try this.

You can also try to put the phone to a better spot (signal wise) when using the wifi tether.

On an unrelated note, please try to be more precise when using units such as kbps. You used bits 3 times and byte once. A small(normal) b means a bit and a large(capital) B a Byte. One Byte is 8 bits. 40 kbps (kilo bits per seconds) is 5kB/s(kilo bytes per seconds). Please do the tests again and edit your question with the correct numbers with correct units or post in a comment.

It is also possible that your computer is doing some stuff (such as cheking for windows updates or antivirus definitions) that might effect your speedtest. Also the compter might show the results in a diffent unit than your phone, so the numbers are smaller but the speed is the same.