The setup was as follows:  PostgreSQL servers hosted in virtual data centers located in Milan, New York, London and HongKong. 

On  each a primary databases were created, each containing the same tables.

These tables were then replicated  in a multi master solution, each primary node replicate on the other three slave databases.

The maximum sustained throughput was then measured for each of these replication systems (during which the other replication system was shut down).

The results: with TCapture, a maximum of 500 transactions per second (end to end) could be replicated before latency started to increase.