I am using same MCU LPC2468 with FreeRTOS in Raw mode, I get about 2.5-3MB/s. I wrote a post on 11/22 that gave more details about my testing/results. At these rates a lot of little factors matter. A lot of code fine tuning, optimization. It's a lot of time consuming testing and trial&error code rewrites. 4MB/s might be possible but 5MB/s may be optimistic, if we are talking about TCP with full checksum and no zero copy. And that is assuming a direct connection between lwIP and PC. 5MB/sec is approaching 50% of the full E100 line speed. Going through a real LAN with traffic is another matter entirely. Just going through our CISCO 2940 switches the speed takes another hit. Increasing the zero traffic direct connection speed beyond a certain point probably isn't going to yield much overall performance gains when operated in a real network. Just my experience.
Chris.
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