How do you download stuff from NCBI fast? I have 2 .csv files that contains a list of accession codes. For example for this experiment a .csv file will contain:

SAMN10870244
SAMN10870243
SAMN10870242
SAMN10870241
SAMN10870240
SAMN10870239
SAMN10870238
SAMN10870237
SAMN10870236
SAMN10870235
SAMN10870234
SAMN10870233


Then I run the following 

for i in $(cat *.csv); do echo ${i}; /usr/bin/sratoolkit/bin/fastq-dump --gzip ${i} &amp; done



Some of my downloads takes a lot of time days. Is there a faster way to get stuff from NCBI?
Are there mirrors of NCBI to accelerate the process?
Why is it so slow?
Answers to this question can be found on biostars. To give you a short summary:


Faster way might be to use the parallel-fastq-dump, as suggested in this answer. I never tested that tool though, my own experience is that prefetch is more stable than fastq-dump command.
In that same post it seems that the Japanese mirror seems faster, don't know if that is still valid.
The reason this is never optimized might be that downloading from SRA is not a task you'll have to do repeatedly, as described here in this post.