This is a...
Problem:
Switching between the kubectl and curl examples using the buttons on the top right makes the page unresponsive for several seconds. Here's a flame graph:

I expect this is because all the examples on the page are being switched at the same time.
Proposed Solution:
Since the root cause is not known for sure, I'm hesitant to suggest a solution. If it is caused by swapping all the examples simultaneously, perhaps only swap examples as they enter the viewport?
Page to Update:
https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.10