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I disagree with the statement that modern memory architectures have much higher read bandwidth vs write bandwidth.

Benchmarks show they are within 30 percent of each other: https://www.techspot.com/images2/news/bigimage/2021/03/2021-...

https://www.anandtech.com/show/2525/5

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While perhaps true, what needs to be compared here is read, vs read + write, no? Just writing isnt enough. And then we are at a factor above 2, assuming no thread contention. If there is contention, it can be a lot higher.

While "write bandwidth" is probably not the right term, writes are more expensive because you need to update caches. If you forked you might need to copy-on-write the page before you can write to it.

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