Total Commander

Showing thumbnails (CTRL SHIFT F1) in a folder with more than around 600 images (small/medium jpegs, ~100MB) maxes out one CPU core on my laptop after a few seconds. Switching to another view (e.g. CTRL F2) resolves it.

There's no slowdown: thumbnails display, scroll etc. at normal speed. Task manager shows the TC process maxing out and nothing else.

This started maybe a year ago, not sure what TC version, on Windows 10 (16GB). I'm now on 10.52 64-bit on a new laptop (Windows 11, 16GB). I'm fairly sure I've thumbnailed this number of images in a folder before, on older laptops too, without a problem.

What is your OS thumbnail provider ?
TC thumbnail config ?
Windows Explorer thumbnail view ok ?

Horst.Epp wrote: ↑2022-12-02, 12:41 UTC What is your OS thumbnail provider ?

Not sure what you mean by that. I'm using TC with mostly standard settings. Universal Viewer is the only plugin, and disabling that doesn't make a difference.

Horst.Epp wrote: ↑2022-12-02, 12:41 UTC TC thumbnail config ?

All default settings in Configuration/Thumbnails. I tried sizes from 16x16 to 1024x1024 and all trigger high CPU.

Horst.Epp wrote: ↑2022-12-02, 12:41 UTC Windows Explorer thumbnail view ok ?

Never used thumbnails in Explorer before, had to look up how to do it, and it was fine - the process spiked for a few seconds then went back to 0.

Difficult to say, maybe a background Antivirus, or a Lister plugin which tries in vain to load certain files.

Try adding the line
DebugIconThread=3
to your wincmd.ini section [Configuration], it will log the used plugins to load the thumbnails. The logged lines will look like this:
Trying with plugin:
Loaded via plugin:

Thanks. Where's that log file stored? I couldn't find a tc related file that updated on exit other than wincmd.ini and it isn't in there.

2Ivan
The logfile is called tcicolog.txt and is placed in your %TEMP% directory.