How can I increase speed?

MacBook S-L-O-W.  Lots of spinning balls, slow loading pages.  Help please

Yes. Preview becomes the default app for PDFs so there is nothing to reset. To put your mind at ease the first time you do this, do a Control-click (right click) on the file and you will see Preview listed as Default. Another way if you are unsure is to highlight the file and Control-click selecting "Get Info". In the panel which springs open to the left of your Desktop, look at the middle area where it reads: Open with: Preview; underneath it reads: "Use this application to open all documents like this one."
One more thing to ascertain about your speed issue. Do you "Empty Trash" or "Secure Empty Trash"? If you do the former then you have a build up of Trash files stored in a hidden file called ".Trashes" [read "dot Trashes"]. This space is designated for the computer to use whenever it will be needed but the files are still there accumulating and occupying space, thus slowing down the whole works. The better option is "Secure Empty Trash"; it will take longer for the operation to complete because now the computer will zero-out the trashed data so that it no longer is on the HDD, recoverable, perhaps, by high-end utilities like TechTool Pro (but that is not a guarantee). Now the space really and truly will be vacant not just designated for overwrite. If you do use Secure Empty Trash it is still not a bad idea to use Disk Utility to "Erase the Free Space" just to get a leg up on the lugubrious performance.

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