Page Switching Lag

I'm seeing a new lag when switching pages in all versions of 18.5 beta that wasn't there before. Maybe 1 to 3 seconds. Seems worse on the first switch, slightly improved afterwards.

Used to be nearly instantaneous always.

i5-2500K
RTX 3060 (12GB)

Anyone else seeing this?

I have noticed a lag when I switch to the deliver page for the first time, it takes around 6 secs, in some cases it can take up to 12 secs. Next time it opens immediately.

With a new empty database it takes about 1-2 seconds the first time.

[Peter Chamberlain]

Some delay is expected the first time a page is selected after launch.
12 seconds seems too long.
Can u post logs.

Some delay is expected the first time a page is selected after launch.
12 seconds seems too long.
Can u post logs.

I did some more testing and I found that the delay on the first time you open the deliver page is related to the number of render jobs you have across the disk database. I searched and deleted all the "Batch Renders" folders from my database and now the deliver page opens fast. When I restored the render jobs it was slow again.

You can try the following to reproduce it:
1. On a disk database create a new project and add around 1000 render jobs (doesn't matter if the jobs are in one project or spread across multiple projects)
2. Restart resolve and create a new project. Go to the deliver page and you will notice a delay.
The more render jobs you add across the database, the longer the delay

I'm on Windows 11 and the disk database is on an NVME drive.
If you can't reproduce it I will post the logs.

I too have noticed a 2-3 second lag opening the Deliver page, which wasn't there prior to 18.5b.

Good thinking it might (currently) be related to the length of the render log, Panos.

Some delay is expected the first time a page is selected after launch..

Expected generally, or in the new beta?

Previous to this beta, it was always fractions of a second for me.

I did some more testing and I found that the delay on the first time you open the deliver page

For me it's all pages, though.

For me just switching to the delivery page, though I never use the cut or fusion pages. And this is with no render jobs queued. Several seconds compared to instantaneous in previous versions.

And this is with no render jobs queued.

Do you mean there is no render jobs for the current project or for all projects across the database?

i5-2500K

That's a *very* old and rather weak processor for the latest versions of resolve.

And this is with no render jobs queued.

Do you mean there is no render jobs for the current project or for all projects across the database?

No render jobs at all. I open Resolve, open my template project, rename the project, “replace” several jpegs that are used for title card, etc, “replace” a timeline placeholder video (mkv with aac audio), trim the top and tail of the video, adjust jpegs on their tracks, use a polygon window on a certain part of the video frame to isolate color correction (if needed), EQ and apply dynamics adjustments to the audio, then switch to the delivery page for export. They are very simple projects. In previous versions, with the same types of projects, switching to the delivery page took less than a second. I don’t know which 18.5 betas this started at because I went straight to one of the later betas (build 3?) from 18.1.x.

Adding to my experience, this delay only happens on the first switch to the delivery page. If I go back to another page, the switch back to the delivery page is instantaneous.

Have been using DR for years, never had a problem with this before 18.5. It is probably 5+ seconds to get the delivery page to load.

You all really have problems with a few seconds of delay?

It’s an annoyance because it has never happened in previous releases. A user experience that changes for the worse is what I would call a bug.

You all really have problems with a few seconds of delay?

When it used to be less than half a second, yes.

18.5.1 still has the lag the first time switching to the delivery tab after opening Resolve.

I had this delay but clearing All cache solved it. Go to the new cache manager and then clear everything. I found I had cache there from things I did a year ago !!

No improvement on 18.6 for me.

This actually got worse in 18.6.2.

I've not had any lag here so far.

18.6.2 I found about 0.5 sec lag the first time a new page is selected. After that it is almost instantaneous. Same on the Studio Max but a little quicker than the PC. Project file is resident on PC and Mac but source files on the same USB C external SSD.

Just noticed this thread but I've been suffering from this issue too, since 18.5. First-time the Deliver page is open, there's a large delay and Resolve is unresponsive. Subsequent switches to Deliver page are quick. If I load another project, the first-time switch to Deliver page freezes again. I haven't connected it to render jobs because it also happened to projects where there were none, but I do have many projects in my Disk database and probably tons of render jobs accumulated across all the projects. Do I now have to go over all of them one by one and clear the jobs to make it better?

Do I now have to go over all of them one by one and clear the jobs to make it better?

As I said in my previous message, if you are using a disk database, you have to open the folder of the database and search and delete all folders with the name "Batch Renders". No need to delete them one by one.

It doesn't matter if the current project has no render jobs. If other projects have render jobs (completed or not) the deliver page will be slow on the first open. The total duration of the delay depends on the total number of render jobs

As I said in my previous message, if you are using a disk database, you have to open the folder of the database and search and delete all folders with the name "Batch Renders"

Thanks, I didn't realize render jobs were just in the folder structure, I thought you were referring to using SQLite client or something to clear the jobs, which was something I didn't feel comfortable doing

Where do I find the Batch Render folder ?

I had to search in the Blackmagic directory and found under Users but they would not show directly. Had to search in that directory even with hidden files set to show. Found lots with contents on the first search. Then opened a project in Resolve, and opened all renders in the deliver page render window and deleted everything that showed up. Now when looking at the Batch Renders folders they were empty. Proceeded to delete. Just did a check to see if I placed something in the render list it would appear. Yes. So now know how to empty folders and delete.


It did not make any difference to page open or switching times though.

Where do I find the Batch Render folder ?

In Project Manager, there's an (i) icon next to your database name, click it and it'll show the location of the database. Do a search within that folder, basically, every project in your database will have its own.

Yes I found that way. It was just the need to do a Windows search that I got stuck on expecting them to be in the list. Have done the same thing now on my Mac. Has made no difference to page switching on Mac or PC though which was fine in my case anyway.

Has made no difference to page switching on Mac or PC though which was fine in my case anyway.

Perhaps you had few render jobs?
Or could be some other variable we are missing.

On my Windows 11 system, with 1200 render jobs, it needs around 8 seconds to open the deliver page for the fist time (or 15 seconds after a Windows restart). With 0 render jobs the initial delay is 1 to 2 seconds.

You can count the number of render jobs by searching for .xml files in the disk database folder.
Each render job has a corresponding .xml file with the following name format a3ec7117-d797-458f-97a8-da021064abb6.xml

In the end I just searched for `Batch Renders `in the users folder on both the Mac and PC. On PC found lots going back several years of course since only had the Mac a year. The interesting things is that there is a Batch Render folder for every project created even if there is nothing in it. If you set a render but do not render and close Resolve there will be a Batch Render file created. If you then open the project and delete the render ( you never made ). The Batch Render folder is still there but empty. So Resolve does not clean up these folders at all. They just accumulate empty. If you select the three dots top right of render window and select all project only those with renders left in those projects render window from those projects will be there whether or not they have been rendered. If you then delete them and go look at the Batch Render folders they will be empty but folders still there. I can see some value if there is a need to go back and re-render something but not sure I see value in keeping empty folders.

when I looked on my PC or Mac I see no xml folders until I did folder search.

I can confirm in v18.5.1 in Windows 10, after deleting all the "Batch Renders" folders and contents, switching to the delivery page for the first time in a session is almost instantaneous.

I wonder if the parsing of these batch render xml files was moved from the time Resolve or a project is opened, to switching to the delivery page so that opening Resolve or loading a project would be faster? I remember at a certain version update opening Resolve and project loading became faster. Was this from v18.1.4 to v18.5?

With 0 render jobs the initial delay is 1 to 2 seconds.

Even that is an order of magnitude longer than it used to be.

Not loving this design change.

I am also hit by this. Modern hardware, lots of RAM etc.

Waiting for the fix.

I had a delay of ~30 seconds when switching to Deliver 1st time. This was annoying, but as I tend to render small multi-timeline projects in batch - it did not significantly affect my primary workflow - other than having the same delay on first batch render.

I followed >> panos_mts << instructions and cleared down the Batch Renders folders - and Viola !!! - my DR is back - with no delay in 1st batch renders, and a tiny delay when first switching to Deliver in the UI.

Prior Database Stats:
- Batch Renders folders: 105
- Batch Renders files: 3500
- Largest Single Project Batch Renders files: 1208

Where do I find the Batch Render folder ?

In Project Manager, there's an (i) icon next to your database name, click it and it'll show the location of the database. Do a search within that folder, basically, every project in your database will have its own.

Thank you! Cleared Batch Renders and can now go to the Deliver page in under a second.

I did some more testing and I found that the delay on the first time you open the deliver page is related to the number of render jobs you have across the disk database. I searched and deleted all the "Batch Renders" folders from my database and now the deliver page opens fast.

Opening the deliver page has been getting slower and slower lately. Now that I have found this thread and deleted all “Batch Renders” folders after a database backup, my Deliver Page opens again immediately.

Thanks Panagiotis !!

Rather than edit the database, click the three dots on the render queue.

Screenshot 2025-03-25 at 8.04.26 AM.png (24.62 KiB) Viewed 720 times

Then select Show All Projects

After it has populated, which may be a while if you're having this issue, you can then, from the three dot menu again, select Clear Rendered or Clear All as needed.

This should remove the Batch Renders from the database without touching the database.

Hope that helps!