[cowsandmilk]

Use of /tmp on regular file system has almost the same behavior because the kernel has a file system cache… if you’re using the file, it will remain available in RAM. There’s some subtle differences, but I’ve seen enough benchmarks around this to have realized that tmpfs doesn’t really have an impact.

[anyfoo]

Yeah, that's why I think the prime feature of tmpfs is more ephemerality than anything else.