Pano2VR was designed to handle very large projects.
You will find settings in the Settings/Preferences for large projects.
The default settings are to load all images immediately and not to Unload Images.
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As in the above screenshot swop the settings so you Deselect Load all images immediately and Select Unload images to save memory.
Depending on how the images were made you may or may not get the thumbnail images in the tour browser and the hourglass will show for images that are not loaded, but that's normale and will stay like that until you select the image you want to work with.
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The above screenshot shows the first image as the project opens showing this, then image 5 as this was selected.
It will also unload images out of the memory if an input image has not been selected after a short time, this frees up your computer's memory.
If you do want all the images loaded then there is another thing you can do.
For speed of loading the images when you open a very large project, one consideration is to convert them to "tiled, pyramid TIFF's".
These have all the multiresolution data and thumbnails in the image file.
When you open the project Pano2VR does not have to do anything with them and they all appear in the tour browser on open with no loading.
It does add to the file size of the TIFF files but if you have plenty of storage then this is very good if you will be opening and closing the project often.
To do this you will need to covert all your images, this is a one-off task but once done opening the project there on after will be much faster.
Pano2VR will make new TIFFs and use these in the project, so it would be a good idea to make a copy of the P2VR file before you do this.
In the project file you will be working with, select all the panoramas in the tour browser, use the keyboard shortcut, Control + A for the PC or Command + A for the Mac.
Then under the panoramas Properties panel select the "Convert Input" button.
Make sure that Equirectangular and TIFF is selected, also the output file path has the _equi.tif on the end. You don't want the original images overwritten.
This will put them into the same directory as the original panoramas so may be a good idea to add a directory to the file path, as an example by default it may want to use: /$n_equi.tif (Mac), \$n_equi.tif (PC).
With a custom directory added to the path: panoramas/$n_equi.tif (Mac). A subdirectory called "panoramas" will be made then the new panoramas will be placed in there. This will make it easier to manage the new images or remove the original images from the project.
Regards,
Hopki