> not once have I seen an explanation of what makes it fast and why those techniques aren't looted for open-source languages
The language design is such that the programs you write can make optimal use of cache and SIMD. The interpreter can only take advantage of that if the language offers you that. It's like saying "not once have I seen an explanation of what makes c so fast and why those techniques aren't applied to python and javascript."
(Note also that the reference J interpreter is opensource and very competitive, performance-wise.)
The language design is such that the programs you write can make optimal use of cache and SIMD. The interpreter can only take advantage of that if the language offers you that. It's like saying "not once have I seen an explanation of what makes c so fast and why those techniques aren't applied to python and javascript."
(Note also that the reference J interpreter is opensource and very competitive, performance-wise.)