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It's about defining an intermediate syntax for the compiler to use, so that optimisations can be performed efficiently. As TFA suggests, if you need an overview on the differences & similarities of SSA and CPS, you could read his earlier article.

I've experimented a little with LLVM's SSA form for compiling and optimising high level procedural languages. And I think he makes a few quite valid criticisms of the way SSA form is defined and used.

This is not a criticism, it's just a statement of fact. Even the fastest javascript engines don't even remotely compete with modern interpreted languages (Java, C#), let alone actual bare-metal code (C and friends).

I dunno, maybe it would be better to look at the code V8 spits out, rather than going with your hunches.

JavaScript quicker on a VM.....

Wait a moment!
Quicker than gcc?