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Several factors significantly impact the transfer speeds for files shared between two Windows PCs on your Local Area Network (LAN). Here’s a breakdown of the key elements to optimize:

1. Network Interface Cards (NICs):
   - Ensure both PCs have high-speed NICs. Gigabit Ethernet (1 Gbps) is common, but upgrading to 10 Gigabit Ethernet can provide a substantial boost.

2. Network Cables:
   - Use high-quality Ethernet cables, preferably Cat 6 or Cat 6a, to support higher speeds and reduce interference.

3. Router/Switch:
   - Your network’s central hub should also support high-speed connections. A Gigabit router or switch is essential, and if possible, one with support for 10 Gbps Ethernet.

4. Drive Speeds:
   - Both PCs should ideally have SSDs (Solid State Drives) for faster read/write operations compared to traditional HDDs (Hard Disk Drives).

5. Network Configuration:
   - Ensure both PCs are on the same network and are configured for optimal performance. Disable any unnecessary services or background processes that could slow down the network.

6. Antivirus/Firewall:
   - These programs can sometimes interfere with file transfers. Ensure they are configured to allow the transfers or temporarily disable them (while ensuring security).

7. Windows Settings:
   - Enable file sharing and configure advanced sharing settings to allow for faster transfers. Use SMB (Server Message Block) protocol for file sharing.

8. Distance and Interference:
   - Minimize physical distance between the PCs and reduce interference from other electronic devices.

By paying attention to these factors, you can ensure faster and more reliable file transfers between your PCs.