A Lab is launching or loading slowly. Most labs, if pre-populated, will load in 3-5 minutes.
Labs often run background setup scripts at initial launch or startup. We recommend having at least 300-500 Kbps of bandwidth per client and 240ms or less of latency. We find that taking a lab in a shared Wi-Fi network may result in a less-than-optimal experience. If you do not have complete control of your Wi-Fi network, we recommend you use cabled, dedicated networking.
To alleviate these symptoms, we recommend that, once the lab is loaded, users spend a few minutes reviewing the lab manual first to allow the labs to "warm up."
To test your networking and compatibility: