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May 31, 2016 7:05 AM in response to Mat_Jankowskiby LarryHN,It is not possible to "migrate back" - you can go back by restoring a complete system backup from when you want to go back to - this will give you exactly what you had when you made the backup - any changes made to any data since the backup will have to be saved separately and later applied to the system
LN
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May 31, 2016 7:13 AM in response to Mat_Jankowskiby léonie,Do you have iPhoto Library Manager? You would need a version, that is compatible with Snow Leopard.
Rebuilding your iPhoto Library on a machine with the older version of iPhoto can downgrade it to that version, see the IPLM documentation:
Downgrading a library to an earlier version of iPhoto
If you have a library from a newer version of iPhoto that you simply want "downgrade" to an older version of iPhoto, the easiest way to do that is with the "Rebuild Library" command. You will want to be running iPhoto Library Manager on the machine that has the older version of iPhoto you want to convert the library to. This will create a new library and import the entire contents of the original library into the new one using the older version of iPhoto. As with any rebuild, there are some items that will not be included (most notably, hidden photos, books, calendars, and slideshows), but if you have none of these items or don't mind losing them in the downgrading process, then this is a decent option for converting a library to an older version.
But it might be preferable to find out why the Mac is slow with Lion and to fix that.
Are you running out of disk storage? Or not enough RAM?
You may have incompatible kernel extensions instlalled.
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May 31, 2016 10:17 AM in response to Mat_Jankowskiby Old Toad,As léonie suggested find out what's causing your Mac to run so slow before jumping the gun and going backward.
Also download and run Etrecheck. Copy and paste the results into your reply. Etrecheck is a diagnostic tool that was developed by one of the most respected users here (and recommended by Apple Support personnel) in the ASC to provide a snapshot of the system and help identify the more obvious culprits that can adversely affect a Mac's performance.