Thanks for your help Chris & Tilghman -- with your insight I'm seeing 25-35% speedups in my app. Here's an example code snippet to help those in the future; it disables access-time updates for the current thread: #include <sys/types.h> #include <sys/sysctl.h> int sysctlValue = KERN_RAGE_THREAD; int sysctlResult = sysctlbyname("kern.rage_vnode", NULL, NULL, &sysctlValue, sizeof(sysctlValue)); assert(!sysctlResult); _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app... This email sent to site_archiver@lists.apple.com