Layer thumbnails also consume RAM; the more layers that you have visible, the more memory is consumed.
Photoshop is constantly updating the thumbnails based on the actions you take. If you do not use the Layer thumbnails, then you can turn them off. Let’s look how…
32. Click on the hamburger menu (three lines) in the top right of the Layers Panel > Select Panel Options > Select None
Simple… The layer thumbnails will now be removed.