> The SDKs are "bundled" in all lambda runtimes but normally not into the binary, what additional performance would that bring?

I haven't looked at LLRT's internals, but if I were them, and I were bundling some JavaScript code into a binary and seeking to really optimize startup time, I would probably pre-parse the JavaScript text to produce QuickJS bytecode (or whatever data structures QuickJS actually interprets at runtime; no modern interpreter is actually processing raw text as it goes). In the best case, embedding something like that into the binary could mean that startup processing of the embedded code is O(1) (just like how startup time for a native-code binary is independent of its size, as long as it doesn't have global constructors).