When playing the scp Foundation's multiplayer server, the problem of being stuck is caused by network delay, server performance, game optimization and other reasons. Here are some solutions:

1. Stability of network connection: Ensure the stability of network connection, and try to avoid sharing the network with other applications or devices with high bandwidth consumption. Using wired connection instead of Wi-Fi connection will provide a more stable network experience.

2. Choose the right server: try to connect to a stable server close to the physical location. Some servers are stuck due to excessive load. Try to connect to another server to eliminate this problem.

3. Adjust the game settings: reduce the game graphics settings, sight distance, special effects, etc. It can reduce the load on the computer and improve the fluency of the game.

4. Update games and drivers: Make sure your game version and graphics drivers are up to date to get the best performance and stability.

5. Shut down background programs: Shut down other unnecessary background programs that are running, release computer resources, and ensure more resources for game running.