Why do i get such a low download speed?

[STEVE L]

There are several factors to consider.
1st, you are probably not getting your 24 MB speed as advertised, which is in direct proportion to your upload speed.
Depending on what type of internet you have, how far away you are from what is called an "office" (not to be confused with where you pay your bills), and how many people are connected to the "pipe"
Think of a 4" pipe 20 feet long, connected to a water supply with only 1 hose connected. Lots of pressure and lots of water. That same pipe in now 400 feet long. Same amount of water but a little less pressure.
Now connect 19 more hoses. Even less pressure and very little water volume.
Internet works about the same way of thinking.