Lightroom 5 Mac slow to render

Very often, when I open a photo, it takes quite a while for the image to be rendered, and I see the message "Loading" as I wait. This is especially annoying when someone is at the computer wanting to see my work.
What should I look for that could be causing this slowdown?
When I have this slowdown problem I turn off nearly all of my other programs.
Thanks so much!
Here are my specs:
Lightroom Version 5.3
iMac 3.4 GHz Intel Core i7
16 GB Memory
Mac OS X 10.7.5
Lightoom files and catalog are on a Promise Technology Firewire 800 RAID DS6400
4 - 1 TB drives
I have run the control software for the raid, and it shows normal activity - no rebuilding is happening.
I DO have several other FW 800 hard drives attached to the chain
I have a few USB devices, with 2 USB hubs.
I ran a software program, MainMenu Pro, which cleared all the caches, repaired permissions, and performed a whole series of maintenance tasks.
I have 325,000. photos in LR even though that is a lot of photos LR's performance is usually quite good.
My catalog size is 3.72 GB

What module are you typically in when you get this "loading" problem? In Develop, it's fairly typical to see it for a second or so (longer if you are opening the image in 1:1 mode), but in Library not so much in normal Fit mode, but possibly yes in 1:1 mode (unless you've got pre-rendered 1:1 previews).
So as you see, there are quite a few variables which need to be clarified in order to determine if what you are experiencing is normal or not. One immediate potential issue is having such a large catalog on an external drive. Have you tried it on an internal drive (if you have the disk space for the associated previews file)? It doesn't have to be SSD (though that would be even better).
But until we find out a little more about your slowdown (which module, which viewing mode, how long the "loading" indicator is showing, what size image files, are 1:1 previews pre-rendered, etc.) it's not too easy to offer any help.

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J'utilise Lightroom sur Mac. Aujourd'hui, impossible d'importer des images depuis une carte mémoire sur un disque dur externe.

J'ai changé de disque dur externe, le problème est le même.
J'ai importé des images sur disque dur interne, l'importation s'est faite sans problème.

Merci pour votre réponse. Ce que je ne comprends pas c’est que je peux ouvrir les fichiers directement du disque dur externe mais que Lightroom ne trouve plus rien.
Le 27 mars 2015 à 22:26, markalanthomas <[email protected]> a écrit :
J'utilise Lightroom sur Mac. Aujourd'hui, impossible d'importer des images depuis une carte mémoire sur un disque dur externe.
created by markalanthomas in Photoshop Lightroom - View the full discussion
Il semble un problème avec les autorisations du disque dur externe, ou peut-être le disque dur externe est en format incorrect (on devrait utiliser le format «Mac OS étendu (journalisé)».
Plus d’informations:
Disque dur externe sous Mac OS
Définir des autorisations
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Lightroom 5 Mac slow to render

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