Slowdown on displaying large directories between thunar 4.21.1 and 4.21.2
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## Version information
Thunar 4.21.2 and 4.21.3
Ubuntu 24.04.3 with Xfce 4.18
## Steps to reproduce
<!--Please, explain as detailed as possible the sequence of actions necessary to reproduce the issue-->
1. ...Launch a single thunar (v4.21.2 or v4.21.3) window and view (list, icon or compact) a directory with 35,000 subdirectories
## Current behavior
On a local NVME disk, it takes 18 seconds to render the view. Doing a Ctrl-R refresh takes 50 seconds.
## Expected outcome
thunar v4.21.1 only takes 3 seconds to render the same heavily populated directory.
## Additional information
Show thumbnails set to never.
Takes 70%-100% of a single CPU core while rendering.
Not sure if this is connected with #1723 or #1315
issue