What causes sometimes long delay in getting thumbnails.

See attached screen capture. This tends to happen, the farther back in time I look for old photos. Entire pages of thumbnails are missing. They only get retrieved when I page down, but sometimes never. Sometimes I have to click on the blank thumbnail in order to force it to appear. This makes it difficult to look for old photos. I just assumed it saved all this information:
Doing an f5 reftresh has no effect. My catalog (about 5gb) and previews (30gb) are on a dedicated Crucial 256gb sata-3 SSD which benches very fast, so the drive should not be the cause. Moreover, the fact that they often never appear should rule out the drive speed. I don't see a lot of settings to control this sort of thing. What might be causing this failure to display thumbnails?
Thanks!

kwdaves wrote:
An image must be on screen for its thumbnail to be created. Scrolling through your library in Grid view and waiting for the image thumbnails to generate on screen should fix it. It's been that way from the gitgo.
Thanks for the reply. Are you saying that the thumbnails only create when they have to, for the first time? That would explain some of what I'm seeing, but not all. There were some mass imports from pre-LR days (that I've only glanced at) that this would explain. But on the other hand, there was a 2010 week long event shoot that had lost all its thumbnails and I know I had looked at them all.
Anyway, its really not that big of deal because most of them regenerate quickly. It's the ones that don't generate unless I zoom them that made me write this.

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Well yes, that just avoids the issue by preventing start-pulseaudio-x11 from starting. I'll try that workaround until a real solution shows up. Thanks for your reply.
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From b4389a752385afd6e65e412a8488828ee3648fbd Mon Sep 17 00:00:00 2001
From: Zsolt Rizsanyi <[email protected]>
Date: Sun, 27 Jun 2010 15:16:13 +0100
Subject: [PATCH 2/2] In KDE only start pulseaudio from the KDE specific desktop file
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What causes sometimes long delay in getting thumbnails.

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