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Optimize mIRC for receiving files
Requirements: mIRC 6.35 and above.
Note: This guide is written using mIRC 7.x
To optimize mIRC for receiving files, perform the following:
- Download TCP Optimizer and use it to optimize Window's TCP stack.
- Open the mIRC Options dialog (in the menu go to Tools -> Options) and navigate to the Connect, Options tab.
- Press the Perform button:

- Enter the following in the Perform commands window:
/dcc packetsize 4096
/fsend on
/pdcc on
Your Perform dialog should match the following image:

- Press OK to close the Perform dialog.
- Press OK to close the Options dialog.
If you are still having problems receiving files, see this guide.