I know what type checking is. :) Both Skew and TypeScript are type-checked languages. Just because a compiler does type checking doesn&#x27;t mean it has to be a lot slower. I was just pointing out that it would be interesting if this alternate compiler design was the reason why the TypeScript compiler is so slow relative to another compiler for a similar language (object-oriented, typed, garbage collected, etc.) that also uses the node runtime, especially since that other compiler is doing even more work than tsc.