Hi Peter,
These previews are a 100% view of actual pixels and, like Standard previews, the Camera Raw engine processes them. When Lightroom generates 1:1 previews, it also generates minimal and standard previews, so all three are available to the program as needed. Because so much data is being processed, 1:1 previews can take a significant amount of time to create. Any time you zoom to 1:1 or higher in the Library module, Lightroom uses 1:1 previews.
To display and work with photos, Lightroom requires a standard or 1:1 preview, depending on the task. If upon import, you only tell Lightroom to generate Minimal or Embedded previews, Lightroom creates Standard and 1:1 previews automatically as you’re working in the application. This process hinders performance. To increase your productivity and reduce this disruption, manage when and how you render your 1:1 previews. Render them on import, or set aside time to render them manually.
To render 1:1 previews on import, use the File Handling panel of the import window. Choose Render Previews > 1:1. Although generating high-quality, 1:1 previews on import slows the import process, it makes Lightroom more responsive when you start to work in the Library module.
An alternative, if you want a speedier import process, is to render minimal or standard previews on import. Then, at any time, select multiple photos in the Grid view of the Library module and choose Library > Previews > Render 1:1 Previews. Let Lightroom process the images before you start to work on them.
Regards,
Sahil
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