Lionel Fourquaux offers this very simple patch to speed up SFTP,

[u/mdw/putty] / pscp.c

diff --git a/pscp.c b/pscp.c
index 9df1963..5792c3e 100644 (file)
--- a/pscp.c
+++ b/pscp.c
@@ -1887,10 +1887,10 @@ static void sink(char *targ, char *src)
 
        received = 0;
        while (received < act.size) {
-           char transbuf[4096];
+           char transbuf[32768];
            unsigned long blksize;
            int read;
-           blksize = 4096;
+           blksize = 32768;
            if (blksize > (act.size - received))
                blksize = act.size - received;
            read = scp_recv_filedata(transbuf, (int)blksize);