Main image View hangs up to 10s when switching photos in develop, rest of the UI stays responsive.

[Wolfgang Lienbacher]

I'm having issues with the speed of the develop module. It completely disrupts my workflow and significantly slows down my pace. When I'm finished selecting my images and I quickly want to adjust my images in the develop view, most images display instantly as expected. But sometimes the all of the UI changes, except the main image view. I can even do adjustments in the dev panel (I use a streamdeck via plugin to do this) and the commands arrive in the develop pane, but the image in the main view is still the old image, and it does not update. This can take up to 10s. 

All this is happening on a Macbook Pro M4 Max with 64GB RAM und 2TB SSD. The images are RAWs from a Sony Alpha 1. From a pure technical point of view, there is really no reason why it could take this long to load 55MB of RAW data from SSD into any kind of other Memory on this type of hardware.  

I would love to find out which piece of software is blocking the main image from displaying for such an incredibly long time. I am also unable to reproduce the problem. I thought deleting the previews from the catalog entirely via finder would give some remedy, but actually it's not. It is a problem that is occurring *every* single time I edit a job, but I cannot reliably perform a routine that would trigger the problem to occur. It's a completly random thing to happen every 1-10 photos, but only while editing images. If I just scroll through the images in develop, it seems it does not happen. But If I do copy and paste commands and adjust a few sliders it happens routinely and it's honestly driving me crazy. 

Anyone else experiencing this kind of behaviour in the recent versions? I feel like it hasn't been this severe in the past. 

[dj_paige]

What software are you using? What version NUMBER? (We need the version NUMBER and not words like "latest" or "up-to-date") What version NUMBER of MacOS?

[Wolfgang Lienbacher]

Mac OS 26.1 and LR 15.0. 

It has however not been specific to these versions, it's been happening in the past few versions as well, I only had the romantic idea that issues like these would resolve themselves at some point in thime, but I've come to the conclusion that this is indeed just a romatic idea. 

[DdeGannes]

@Wolfgang Lienbacher , you stated in your original post " I can even do adjustments in the dev panel (I use a streamdeck via plugin to do this) and the commands arrive in the develop pane, but the image in the main view is still the old image, and it does not update. This can take up to 10s."

There have been significant changes to LrC in the past two years, have been getting updates from the developers of the Plug-in you are using.

[Wolfgang Lienbacher]

I am 99.9% sure the problem is not in any way related to the plugin. All the plugin does is make calls to LrDevelopController,  namely increment(), decrement() and setValue(). As far as I am aware, this is nothing that has seen any kind of significant changes that would require an update of a plugin.

In any way, I used it as a way to describe the symptom. All keyboard shortcuts work as well while I wait for the main image View to update the image. I really only wanted to outline that the Lightroom UI seems to be responsive. 

[Wolfgang Lienbacher]

Been thinking about this again, even if it was the plugin, all the plugin does is open a socket, wait for commands and send those commands. It also reads all values and sends those via the socket for the values to be reflected in the displays of the streamdeck. 

So, let's assume it was the plugin taking 10 seconds to read the values of all sliders, and send them via the socket, this would mean the lightroom plugin sdk would block the develop image view from rendering, but at the same time allow the plugin to receive and control the develop sliders with no issue. I think it's save to assume that if this was true, this would qualify as an architectural bug in the lightroom architecture that should be fixed. 

I'll have a look at the stream deck next time the bug occurs during editing, if the the slider values update when the images are switched but the view is not rendered I can rule out this issue, if it is not I'll investigate further. 

Additionally: I assume you are not experiencing this kind of problem at all?

[DdeGannes]

I do not use that Plug in.

However there is a new update to LrC version 15.0.1 that has several critical bug fixes.

• Lightroom Classic 15.0.1 is available for download.
•