download speed in google cloud storage

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I am using the MediaIoBaseDownload to implement download from GCS.

But I found that the download response is always about 5 seconds between each response.

if I download two files at the same time, the gap between each response will around 10 seconds.

upload speed is fine, it only occurred while downloading.

Is there any limitation about the download API cause I could not found the limitation.

after add some log information I found that the most time spent at the response.read() in httplib2

Could I think this is the limitation that GCS server holds or is there any setting of buckets(e.g. like DRA) that will affect the download speed?

I am using python of 2.7.8.

thanks!

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