>There's no forum that this really fits in, but it is related >to D800 file sizes, so I'll stick it here in case it's of use >to someone else. > >I then took it a step further and tried it with a 152mb .jpg >file. FastPictureView took just under 7 seconds to load the >image, and IrfanView took just over 3 seconds. The big >advantage FastPictureView has is that it extracts the .jpg >element of large .tif files, which IrfanView doesn't. I'm not >a great user of .tif to be honest. If I need layers etc. I use >.psd or, if not, I use .png. > >Like I say, I don't know why IrfanView is now faster than it >ever was for me, but it is. It could be that FastPictureView >installs a codec of some sort which is then utilised by >IrfanView, but I really have no evidence apart from my own >eyes. > >Even with Photo Mechanic 5, I no longer see that half second >of pixelation whilst the full image window redraws a full size >.NEF, so I know something has definitely changed.
If you are viewing an image in one application and then switching to a second application and find that the second application views the image faster than the first application then this is likely caused by the OS' unified disk cache keeping the image file's contents in RAM, which loads into another application's address space hundreds of times faster than loading directly from disk. I would expect the first application to also load the image faster if you quit it, launched it again immediately and then loaded the same image again.
To truly compare apples to apples you need to either restart your computer between tests, or flush the system's unified disk cache. Flushing the disk cache on Windows is not straightforward though. Most solutions involve running applications that use up so much memory that the system dumps the disk cache in order to fulfill the memory allocation requests of the memory hog apps.
We do these same kinds of tests on Photo Mechanic to make sure that our own caching and image decoding systems are working at their very best.
Kirk A. Baker Senior Software Engineer Camera Bits, Inc.