Reply to post: Re: Observations

Roughly 30 years after its birth at UK's Acorn Computers, RISC OS 5 is going open source

ThomH Silver badge

Re: Observations

I can't speak confidently as to the others, which is going to make me sound like an apologist, but I know that macOS née OS X spends modern-scale processor cycles on:

(i) using the full set PDF primitives for all desktop drawing;

(ii) the dynamic dispatch that underlies its approach to UI building;

(iii) contrasted with Risc OS, the various context switch costs associated with preemptive multitasking and a full implementation of protected memory*; and

(iv) various things that were historically optional: the file indexing that goes into Spotlight, the background backup of Time Machine, the remote syncing of iCloud file storage, etc.

* if memory serves, Risc OS protects applications from each other, but doesn't protect the OS from applications.

Do you necessarily want these things? Tough, you're getting them.

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