Updated to 9.3 and switching between photos in the Dev module became very slow, 10-12 seconds. After a lot of messing around with settings and whatnot, I found that resizing Lightroom so it covered half the desktop sped things up considerably, changing selected photo reduced to less than a second.
Has anyone encountered this, does anyone have thoughts?
Edit: This is only in the Dev module, performance in the Library module, single image or grid, is just fine. And it does seem to be related to the main image display size; increasing the width of the side panels speeds things up a bit.