I have a folder with about 50k images - when selecting an image there is a long delay before it is displayed.
There is also a long delay after selecting the escape key to return to the browser list.
Version 1.8.8 on a Mac Studio M2U/128GB/4TB running MAcOs 15.4.1.
Any thoughts on how to speed this up?
Images very slow to display after selected in browser
Moderators: helmut, XnTriq, xnview, Dreamer
Re: Images very slow to display after selected in browser
When you open an image into an image tab, or when you select a thumbnail to display preview?
Pierre.
Re: Images very slow to display after selected in browser
When I select an image it fills the main window.
Re: Images very slow to display after selected in browser
Image tab? Please post a screenshot
Pierre.
Re: Images very slow to display after selected in browser
I can confirm that this is a problem.
XnViewMP 1.9.2 can be very slow to open images from the browser tab. By that I mean you're viewing thumbnails in the browser tab, and you double-click on a thumbnail, and the image then opens in it's own tab. This problem does not occur in v1.7.1
The slowdown is proportional to the number of images in the directory. If there are 10 files, the image opens immediately. If there are 500 files (20mp jpeg images) it takes fully 18 seconds for XnViewMP to become responsive again.
The timeline is like this:
0:double-click
0.5s: new tab opens, image is displayed, but the titlebar of the app and the tab contains <Empty>
0.5s-18s: the application is unresponsive during this time, to clicks or mouse button presses or scroll wheel actions
18s: the window title and tab title populate with the filename. the app is now fully responsive to user action.
Interestingly, once you have paid this 18 second penalty, switching between images using hotkeys is basically instant, a quarter of a second.
But if you close the tab the image is in, and then from the browser reopen the same image or a different image, you get another long delay equal to the first time.
This occurs even after completely purging the application thumbnail database. This is tested with the folders on multiple different SSDs which are in good working order.
What is it doing between the time of image load, and the time the title of the tab is populated, that could be so slow?
XnViewMP 1.9.2 can be very slow to open images from the browser tab. By that I mean you're viewing thumbnails in the browser tab, and you double-click on a thumbnail, and the image then opens in it's own tab. This problem does not occur in v1.7.1
The slowdown is proportional to the number of images in the directory. If there are 10 files, the image opens immediately. If there are 500 files (20mp jpeg images) it takes fully 18 seconds for XnViewMP to become responsive again.
The timeline is like this:
0:double-click
0.5s: new tab opens, image is displayed, but the titlebar of the app and the tab contains <Empty>
0.5s-18s: the application is unresponsive during this time, to clicks or mouse button presses or scroll wheel actions
18s: the window title and tab title populate with the filename. the app is now fully responsive to user action.
Interestingly, once you have paid this 18 second penalty, switching between images using hotkeys is basically instant, a quarter of a second.
But if you close the tab the image is in, and then from the browser reopen the same image or a different image, you get another long delay equal to the first time.
This occurs even after completely purging the application thumbnail database. This is tested with the folders on multiple different SSDs which are in good working order.
What is it doing between the time of image load, and the time the title of the tab is populated, that could be so slow?
Re: Images very slow to display after selected in browser
A followup on this...
I downloaded a fresh copy of the portable 1.9.2, and ran the application directly from that folder, making absolutely no changes to settings.
The problem did NOT occur, and XnViewMP was generally much faster. It was many times faster at generating thumbnails in the browser.
So the problem that is being reported is triggered by one of two things:
1. A situation or corruption in the catalog database that survives a total purge of all thumbnails and file data AND an Optimize run
2. Ordinary settings changes that do not exist in the default settings of a download
I'd consider #1 a defect. #2 could be a defect, or if there is a known setting that can cause performance problems like this, the fact that there is no warning about it could be considered highly problematic.
I'll report more after further testing.
I downloaded a fresh copy of the portable 1.9.2, and ran the application directly from that folder, making absolutely no changes to settings.
The problem did NOT occur, and XnViewMP was generally much faster. It was many times faster at generating thumbnails in the browser.
So the problem that is being reported is triggered by one of two things:
1. A situation or corruption in the catalog database that survives a total purge of all thumbnails and file data AND an Optimize run
2. Ordinary settings changes that do not exist in the default settings of a download
I'd consider #1 a defect. #2 could be a defect, or if there is a known setting that can cause performance problems like this, the fact that there is no warning about it could be considered highly problematic.
I'll report more after further testing.
Re: Images very slow to display after selected in browser
I've found what triggers this issue.
It's the Thumbnail -> Labels setting.
Putting a reference (using to one of the custom fields) to Exiftool triggers this problem.
For example, define Custom 1 as:
WB:{ExifTool:WhiteBalance2}
This will show the value of the WhiteBalance2 tag (from MakerNotes) in the label.
Others may have used this feature and not noticed a problem, because the slowdown only becomes noticeable when there are a large number of images in the folder.
It is understandable that this would cause a slowdown when loading a directory of files in the browser, as the application is calling exiftool to populate each label.
What is not understandable is why this would be done again, for apparently every file in the directory, when a single file in the browser is double-clicked to open it in the viewer.
The contents of the Labels setting should have no impact on performance when opening a file, after the folder has already been scanned.
I understand that calling Exiftool from the Labels setting might be an edge case, but nonetheless XnViewMP is doing something here it shouldn't be doing.
Once a folder has been scanned and the labels populated, that should not be done again unless the Labels setting is changed, or a new folder is navigated to.
It's the Thumbnail -> Labels setting.
Putting a reference (using to one of the custom fields) to Exiftool triggers this problem.
For example, define Custom 1 as:
WB:{ExifTool:WhiteBalance2}
This will show the value of the WhiteBalance2 tag (from MakerNotes) in the label.
Others may have used this feature and not noticed a problem, because the slowdown only becomes noticeable when there are a large number of images in the folder.
It is understandable that this would cause a slowdown when loading a directory of files in the browser, as the application is calling exiftool to populate each label.
What is not understandable is why this would be done again, for apparently every file in the directory, when a single file in the browser is double-clicked to open it in the viewer.
The contents of the Labels setting should have no impact on performance when opening a file, after the folder has already been scanned.
I understand that calling Exiftool from the Labels setting might be an edge case, but nonetheless XnViewMP is doing something here it shouldn't be doing.
Once a folder has been scanned and the labels populated, that should not be done again unless the Labels setting is changed, or a new folder is navigated to.
Re: Images very slow to display after selected in browser
currently when you open an image file, the file list is scanned and labels updated
Thanks to your detailed description I can reproduce the problem.
Thanks to your detailed description I can reproduce the problem.Pierre.
Re: Images very slow to display after selected in browser
This problem is supposed to be fixed in XnView MP 1.9.3. Please check and confirm the bug fix here.
Pierre.
Re: Images very slow to display after selected in browser
Yes, this is fixed. Thank you!