Please take a look at this. The blazor demo site is completely useless right now. Tested on a few machines. Best case scenario you might land on one of the pages, from there one is a disaster.
Yes, we are aware of the speed problem and we are working to fix this. For the third time in the past two weeks we are fighting with unusual severe load.
As alternative you can browse our demos on Azure while DO are working on our case:
We were able to resolve the performance problem and our official Blazor demos are up and running!