Style Configurator performance issue

[donho]

Description of the Issue

While switching among languages in Style Configurator, the stylers are loaded very slowly.
Also while modifying in "User Ext." edit field, UI freezes.

Steps to Reproduce the Issue

1. Open Style Configurator
2. Switch among the language
3. Edit in "User Ext." edit field

Expected Behavior

UI should not be frozen

Actual Behavior

Doing 2. & 3. make UI frozen

Debug Information

Notepad++ v8.5.8   (64-bit)
Build time : Oct 15 2023 - 21:43:56
Path : C:\Program Files\Notepad++\notepad++.exe
Command Line : 
Admin mode : OFF
Local Conf mode : OFF
Cloud Config : OFF
OS Name : Windows 11 Home (64-bit)
OS Version : 22H2
OS Build : 22621.2506
Current ANSI codepage : 1252
Plugins : 
    mimeTools (2.9)
    NppConverter (4.5)
    NppExport (0.4)
    PythonScript (2)
    VisualStudioLineCopy (1.0.0.2)