In episode 4 of the Knowledge Panel we discuss: How good IS Google at understanding Javascript compared to a few years ago?  It used to take quite a long time for Google to crawl and index Javascript. How fast is it these days and how did it get so fast?  People often say that Javascript slows a site down and we all know that speed is really important to Google... so is it true? Does Javascript slow a site? Or can it even speed it up?  What’s Google’s Web Rendering service?  How can people minify javascript files? Does it help much?  What is Google BAD at seeing in Javascript?