If you are using a LAN network that is particularly poor or using broadband access, you can set the appropriate tcpwindow value in the Registry to speed up Internet access. (Please note: if the network speed is normal, the effect is not obvious) Open the Registry Editor (the simplest way is to start-enter Regedit in the running process ), find the "HKEY_LOCAL_MACHINE \ SYSTEM \ currencontrolset \ Services \ Tcpip \ Parameters" sub-key, in the right key value area, find or create a New DWORD key value item named "globalmaxtcp windowsize", set its data value to "256960" (decimal), close the registry editor, and restart the computer. Is it faster than before? The principle of this change is: Normally, the default data transmission unit of TCP/IP accepts a buffer size of 576 bytes. If the buffer size is set to a large value, once a TCP/IP group data error occurs, all the group content in the entire data buffer zone will be lost and re-transmitted. Obviously, the data is continuously transmitted, this will greatly affect the efficiency of data transmission over ADSL. To this end, set the appropriate buffer size to ensure that the efficiency of data transmission over ADSL is always high, which will have a direct impact on the transmission speed of ADSL!