Author of the talk here. When I am doing conference talks to help explain abstract concepts or ideas, I typically prefer to employ a strategy called surrealist satire. This basically helps people understand where something fits into the stack by demonstrating how something fits into the mold and then by doing another completely impractical thing with that surrealist solution. The goal of this is to help people hook something into a greater set of context (due to the assumptions I made about the audience, I had to explain a bit more about the topic than I would have otherwise at say a WebAssembly conference) so that they can figure out how things that seem unrelated are actually quite related.

In terms of performance numbers though, I have quite intentionally NOT included performance benchmarks in this talk because getting stable performance information is nontrivial. I plan to write something in the future about WebAssembly vs native code as a subprocess (the differences with windows may surprise you!), but that is not a thing for today.