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. The following 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 that consume a lot of bandwidth. Using wired connection instead of Wi-Fi connection will provide a more stable network experience.

2. Select a suitable server: Try to connect to a stable server that is close to the physical location. Some servers are stuck due to high load. Try to connect to other servers to eliminate this problem.

3. Adjust the game settings: reducing the game graphics settings, sight distance, special effects, etc. 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 driver are up to date to get the best performance and stability.

5. Close background programs: Close other running unnecessary background programs to free up computer resources and ensure more resources for game running.