The main argument here is that native languages let you get the most out of your CPU if you want, whereas with the JVM you're probably stuck unless you use JNI, in which case why not just go straight to native?
Yes, I'm aware of loop vectorization in C compilers. I'm also aware of loop vectorization in Java JIT compilers. Do you think there is anything specific to C or C++ that makes this easier than in Java? There isn't.
> The main argument here is that native languages let you get the most out of your CPU if you want
Most applications, including probably more than 99% of Chromium, are not the kind of code that would benefit from manually written vector intrinsics. Does the "main argument" claim that these 99% would also be 5x or 10x slower if they were written in Java?