Why's SD -> Ethernet Card -> Webbrowser so slow?

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If you want to avoid the fate of the OP, then you need to send these files more than one byte per packet. If you are sending a big file, this will take relatively forever.

            while (myFile.available()) {
              client.write(myFile.read());
            }
            // close the file:
            myFile.close();

This sends the data in 64 byte packets, rather than one byte per packet.

  Serial.println("Writing");

  byte clientBuf[64];
  int clientCount = 0;

  while(fh.available())
  {
    clientBuf[clientCount] = fh.read();
    clientCount++;

    if(clientCount > 63)
    {
      Serial.println("Packet");
      client.write(clientBuf,64);
      clientCount = 0;
    }
  }

  if(clientCount > 0) client.write(clientBuf,clientCount);

edit: If you want it to work really fast, remove or comment out the Serial.println("Packet") statement. That was just for debugging.