Why is my machine (CPU) working very hard when I use the Jotform builder?

My computer is sweating when I use the builder, why is that?
A thing I only experience when a website is 'unwittingly' being crypto-mined...
I'm sure that's not the case here, but wonder why.

Is this happening when you edit a specific form? It could also be due to forms or browsers cache. Please try the following:

1) Clear your forms cache: https://www.jotform.com/help/229-How-to-Clear-Your-Form-Cache 

2) Clear your browsers cache.

If the issue persists, please let us know in which of your forms we should test further.