Load large data slower

I use gsql load a 1GB data to graph,it runs fast at begining,but it gets slower and slower ,this is the load picture,when load 1% data, the rate is 17kl/s,now just 3kl/s

What is the average rate? How long did it take to load the 1GB of data?

it took 5 hours to load 82% data,and it stopped working for a long time after 82%, so I stopped the program and the final rate was only 800l/s