This is normal indeed and I don't think you can do much about it apart from having your preview database and catalog on a SSD disk which will minimize the delay.
If you have the previews and catalog file on an SSD, then I think this is about as fast as you can make things.
I occasionally have the same pixelization that you see for about a half-second.
By the way, this is an area where getting a faster graphics card won't help at all, the graphics aceleration used by Lightroom does not affect the Library Module at all.
OK. This is disappointing to hear, but at least I can have proper expectations for the user experience in Lightroom. Thanks for this feedback.
For what it's worth (and I know that neither of you are able to officially speak for Adobe), but Adobe seems to now be heavily promoting Lightroom as an encouraged upgrade path from Photoshop Elements. I wonder if there will be many new users of Lightroom in the coming months who will go through the same experience I have had. At least I have an SSD available. If not, my experience scrolling through the Library would be unbearable. Lightroom is a great product. Power users and professionals likely overlook any weaknesses in the user interface, because of the many other powerful features it offers. However, if Adobe begins funneling masses of "regular consumers" into Lightroom (especially consumers used to the more refined, consumer-oriented user interface of Photoshop Elements), then I wonder how that's going to go.
Again, I appreciate all the helpful feedback here, and I realize that only Adobe designers themselves can really address this issue. I just have the feeling I'm on the cusp of a wave of many would be Elements-to-Lightroom adopters, and that is a leap from consumer-oriented software to professional-oriented software that may be fraught with frustration.
I don't know how to mark both of your answers as the "correct answer". Sorry about that.
Don't worry about that and your point above is well taken. I can get frustrated by this myself and I use fairly fast hardware.
Let me point out that I do not use an SSD, and I either have gotten used to these scrolling/pixelization problems for a fraction of a second, or they simply aren't present at times.
However, if Adobe begins funneling masses of "regular consumers" into Lightroom (especially consumers used to the more refined, consumer-oriented user interface of Photoshop Elements), then I wonder how that's going to go.
You are one of a very few people to complain about this issue, and even you call this problem "niggling". So it's hard for me to imagine that by Adobe funneling masses of regular consumers into Lightroom, that there will be a mass objection to this problem.
I'm not sure whether you have some other hardware problem (although I can't imagine what that might be) or you are just more sensitive to this issue. In any event, I think Adobe has other Lightroom speed issues that they need to address that are much more serious rather than "niggling" problem we are discussing.