PHP and MySQL are actually very fast, check out Tech Empower's benchmarks (https://www.techempower.com/benchmarks/#section=data-r10&hw=...).
Remember Facebook is built on PHP. For this purpose (distributed servers) it's a perfect stack. Easy to code for and very fast. Security is one of our primary concerns and I assure you that Thndrstrm has our users' privacy and security in mind at all times.
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Why why why is this PHP and MySQL? Can we please stop using stacks that do not scale and have severe security problems?
PHP and MySQL are actually very fast, check out Tech Empower's benchmarks (https://www.techempower.com/benchmarks/#section=data-r10&hw=...). Remember Facebook is built on PHP. For this purpose (distributed servers) it's a perfect stack. Easy to code for and very fast. Security is one of our primary concerns and I assure you that Thndrstrm has our users' privacy and security in mind at all times.
Fast != scalable