Android download performance

[astaikos-hp]

Hello. Using SFTP to download files from our SFTP server and are experiencing slow downloads on Android as if it is only downloading one chunk at a time. Our application is operating as expected in Windows and iOS. Are there any settings that we can tweak to help the download speed on Android?

[Rob-Hague]

Are you using SftpClient.DownloadFile? Any other method does download one chunk at a time (at the time of writing).

Aside from that, SftpClient does have a BufferSize property (and there are other internal properties) but I would not know whether the existing values are somehow sub-optimal on Android

This is assuming that the device has bandwidth to spare

[astaikos-hp]

I am using SftpClient.DownloadFile.

I have tried setting the BufferSize to 1MB and 4MB, but still not getting equal performance on Android device as opposed to other devices. What other properties can I look at?

[Rob-Hague]

Ok, you are using the best method, and actually the BufferSize does not make any difference above 64KB. I think your best bet is to measure bandwidth / latency / TCP window size. These will help inform you whether the network is the bottleneck or something else.