I use pscp in my windows pc to send or retrieve packets to a ssh server running in linux in a LAN envrionment. Having talked with somebody else uses Linux ssh client, I know their speed is fine about 30M bps (our LAN speed is 100M bps.) If I re-boot my windows pc, at the very beginning and for the first couple of times transmission to the linux server , the speed was fine about 2-3M bps, (still slow compared with linux ssh client). However after time duration, the speed becomes pathetically slow to 200 -300 kbps which is not acceptable.
I downloaded the latest putty from the website so I assume the problem is not putty itself.