Hi SZ,

> Ok I think the problem is in sliding windows then. Make sure the receiving 
> client/server has a large sliding window. There is a way to calculate it but 
> I am not sure of the exact formula. Something related with the round trip 
> times and bandwidth. Sliding windows _should_ be explained in wikipedia.

Yes, the sliding window property of TCP/IP is adjusted. Please have a
look at my initial posting and you'll find out that I compared the
throughput of ICS FTP demo server to that of the Indy10 FTP demo server
on the same computer using the same connection.

Today I have found out that the problem is solved for this special case
when increasing the BufSize of tWSocket to large values (around 1MB
gives a throughput of ~7.7MB/s). Now my question is if it is a good idea
to use such big buffers for file transfers in general.


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