Have you profiled this? The first thing I would to is run that in Instruments.
Georg > Am 9. May 2020 um 14:44 schrieb Gabriel Zachmann via Cocoa-dev > <cocoa-dev@lists.apple.com>: > > Again, thanks a lot for all the helpful hints. > > Before restructuring my code, I did a few timings, using a set of test images > ranging in size from 30 through 300 MB. > I used mach_absolute_time() for this experiment. > And now, I am confused. > > These are the execution times I have found for some of the methods that I > invoke in the process of loading and displaying the next image: > > CGImageSourceCreateWithURL: 0.4-1.4 millisec > CGImageSourceGetStatus: 10-600 microsec > CGImageSourceCopyPropertiesAtIndex: 0.8-9 millisec > CGImageSourceCreateImageAtIndex: 15 microsec > convertToNSImage (*): 25 microsec > imgLayer.contents = nsimage: 1-5 microsec > removeFromSuperlayer: 0.1 microsec > addSublayer: 5-10 microsec > > (*): this is a wrapper method of mine that does a few calls to > CIImage/NSImage/NSCIImageRep methods. > > Overall, none of the methods I invoke seems to incur a long execution time. > Yet, there is a noticeable lag when my app switches from one image to the > next one. > I can tell because all layers have an animation assigned. > Sometimes , there is even a stutter in the animation itself. > > But it doesn't seem like it makes sense at this point to load images in a > concurrent/background dispatch queue, does it? > > So, I am confused: where is the lag coming from? > > Any ideas how I might be able to prevent the lag/stutter when loading and > switching to big images? > > > Best, G. > > _______________________________________________ > > Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/cocoa-dev/georg.seifert%40gmx.de > > This email sent to georg.seif...@gmx.de _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
