After the defrag, you can see anywhere from 10 to 30% boot time/app load speed increase, but your mileage may vary depending on other variables not covered in this post.When the GET_DOG query completes, its result is stored in the Apollo Client cache. I myself like to delete the layout.ini file once or twice a year, do a reboot, work normally for a day or two, and then do another reboot followed immediately by a defrag. I don't know if CCleaner will delete the layout.ini file itself, as it probably uses it to determine which *.PF files to get rid of (drive space cleaning). It can then be used by windows defrag, to put those files contiguously onto the drive in one spot in the actual order that they are loaded into memory (including OS boot files), which has the effect of speeding your OS boot and application load times tremendously. If you then use your computer as you normally do (it records the apps loaded frequently), and you then do another reboot.
Deleting it usually slows down both your boot time and application loads the next time you reboot, but that's because windows is rebuilding that ini file.
Sometimes, the layout.ini file in the prefetch dir holds on to some really old files that haven't been accessed in a while, even MPG & AVI files (stuff not really needed to be loaded at boot time). Initially, yes, you might see a slight decrease in performance initially, but eventually your performance, and memory usage (lower) should improve. I realize that by default this option is not checked but many users may check it thinking it is beneficial to do so. It seems to me that for most users clearing this data would cause a decrease in performance rather than help performance.
You should think about putting the "Old Prefetch Data" option within its own category.
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