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Setting the Send Buffer
Especially when connecting from outside the PTC network, upload times for primary content to https://ptcprojectlink.ptc.com/ProjectLink/ can be slow. On Microsoft-based clients, one factor which can affect performance is the send buffer in Internet Explorer. The value for this can be modified using the following technique.
* 
PTC accepts no responsibility for any damage resulting from the technique below. Changes to the registry are made at the individual user's risk.
1. Start the Registry Editor (Regedt32.exe).
2. Locate and then click the following registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings
3. On the Edit menu, click Add Value, and then add the following registry value:
Value name: SocketSendBufferLength
Data type: REG_DWORD
Radix: Decimal
Value data: Buffer size that you want (in bytes)
Buffer size value options:
16-KB Buffer = 16384
24-KB Buffer = 24576
32-KB Buffer = 32768
40-KB Buffer = 40960
56-KB Buffer = 57344
64-KB Buffer = 65536
4. Quit the Registry Editor.