Hello @frankbrasington97,
I assume that you talk about the ENCOR E-learning that is available at The Cisco Learning Network Store and also at Cisco U.
The lab environments for these courses are all hosted by Cisco.
When you click to start a lab, the environment will be prepared in the background which typically takes around 5 - 15 minutes depending on the amount of devices and complexity of the preparation scripts. During this preparation time you can continue to read through other sections or watch videos and you will get notified once the lab environment is ready for you.
Access to the lab and and all devices like routers, switches, admin station, etc. is provided within the e-learning environment on your web browser. So the performance of your personal pc does not matter at all as long as you have a stable internet connection.
HTH!
