When you open the game for the first time, the game needs to download additional resources to ensure proper operation. During the download process, the game may lag, this is normal. Please wait patiently for the download to complete, after which the game will run normally. 

After the download is complete, if the game is still laggy, you can try the following steps to solve your problem:
1. Close the game completely and restart it.
2. Make sure your device is in a stable network environment.
3. Go to [Player Info] - [Settings] - [Graphics], turn down resolution and adjust [FPS] setting."