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This is probably due to packet loss in your "slow" direction - but no loss in your "fast" direction.

The TCP "Congestion Avoidance" algorithm slows down the transmit rate when it detects packet loss (and assumes "congestion" somewhere in the path).

We'd need to see a packet capture file to prove this. However, you can see this for yourself by looking at Wireshark's graph: Statistics - TCP Stream Graphs - Window Scaling.

Have a look at my answer to question number 15002.

This is probably due to packet loss in your "slow" direction - but no loss in your "fast" direction.

The TCP "Congestion Avoidance" algorithm slows down the transmit rate when it detects packet loss (and assumes "congestion" somewhere in the path).

We'd need to see a packet capture file to prove this. However, you can see this for yourself by looking at Wireshark's graph: Statistics - TCP Stream Graphs - Window Scaling.

Have a look at my answer to question number 15002.