Re: How Can I Notify DrawRect Method?
Re: How Can I Notify DrawRect Method?
- Subject: Re: How Can I Notify DrawRect Method?
- From: "Sean McBride" <email@hidden>
- Date: Tue, 9 Dec 2008 22:37:52 -0500
I. Savant (email@hidden) on 2008-12-09 8:25 PM said:
> Asking for the shared user defaults instance, then asking it for a
>value, then unarchiving a more useful object from it, *then* using it
>to draw is certainly more work than caching the value only when it
>changes. It's not like it's performance tuning - it's *basic design*.
Well, such things are never black and white, of course... but I just
wanted to add that caching the value increases your application's memory
use (admittedly only slightly in the case being discussed). But in the
general case, by increasing memory use you:
- can fit less in the CPU's cache
- increase paging
- etc.
So it could actually lead to making your app slower!
IMNSHO, best to write the least code possible, profile, and change as needed.
Sean
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