I send data from evaluation board MCB2300 (with LPC 2378 microprocessor) to a user's PC via Ethernet using TCP/IP protocol. A program named Ethereal shows that MCB2300 transfers 1024 bytes segment during 7-8 ms after ACK is received from PC. Why the transfer is so low? (Program sample is EasyWeb).
Stop. Take a deep breath. Everybody can hear you. Nobody knows that answer yet, also because your problem can stem from multiple sources. You must provide more fact-based analysis, to give people a leverage. And be patient.