If you open a folder that contains many pictures, a blue "wait animation" is displayed in the upper right corner of the Lister.
In the background the metadata of the images (e.g. width and height) are read. For example, if you want to display the height in a column, the values for it appear immediately.
This background activity, however, requires quite a lot of resources (especially for folders with many images). That is impractical, especially on a notebook.
How can this background activity be switched off?