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>I would assume any modern processor would make a context switch a one instruction affair.
Has been the historic assumption, has been proven to be wrong by every possible benchmark.
Consider tech empower[0] for raw stack performance , runtime level threads outperform IO threads since OS thread were designed to be mapped on physicals cores.
This is very expensive and inefficient.
Creating one thread for every request you have ( Apache + PHP ) will exhaust the hardware after a few thousands/qps target.
Runtime can indeed have millions of those “lightweight threads” without killing your machine since they create a pool from physical threads and tap into IO events to efficiently switch or resume contexts. This is by far much faster.
[0] https://www.techempower.com/benchmarks/#section=data-r20&hw=...