VERY SLOW CONNECTION WHEN COPYING FILES

PEER TO PEER CONNECTION AND USING CABLE MODEM CONNECTED TO THE INTERNET. NO PROBLEM WITH THE INTERNET CONNECTION, BUT WHEN COPYING FILES BETWEEM COMPUTER A TO COMPUTER B IT TOOK A LONG TIME OR VICE REVERSE SAME PROBLEM. AND SOMETIME CAN NOT SEE EACHOTHER AT ALL.
COMPUTER A IS WINDOWS 95 AND COMPUTER B IS WINDOWS 98, BOTH USIING THE SAME PROTOCOLS, TCP/IP AND NETBEUI, SAME WORKGROUP NAME AND NIC ARE BOTH 10/100. CAN SOMEONE TELL ME WHAT IS THE PROBLEMS. THANK YOU