Is there an existing issue for this?

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Problem description

When using the "Export" function in FreeCAD to create a WebGL file (.html), two issues are observed:

1. Encoding Mismatch: The exported file is encoded using the system default encoding (ANSI, which typically points to encodings like GB2312 depending on the system). However, the HTML structure declares <meta charset="utf-8">. This mismatch can lead to rendering issues and is not the expected behavior.

2. Slow Export Performance: Exporting a WebGL file takes an unusually long time, significantly longer than exporting a .step file. The WebGL export can take several minutes, while .step export completes almost instantly.

Full version info

OS: Windows 11 build 22635
Architecture: x86_64
Version: 1.0.0.39109 (Git) Conda
Build type: Release
Branch: (HEAD detached at 1.0.0)
Hash: 2fcc5317fe3aee96ca73475986a577719fc78e20
Python 3.11.10, Qt 5.15.15, Coin 4.0.3, Vtk 9.3.0, OCC 7.8.1
Locale: Chinese/China (zh_CN)
Stylesheet/Theme/QtStyle: FreeCAD Light.qss/FreeCAD Light/Fusion

Subproject(s) affected?

None

Anything else?

Steps to Reproduce

1. Open a model in FreeCAD.
2. Select "Export" from the File menu.
3. Choose "WebGL file (.html)" as the export format.
4. Save the file and observe the encoding and export time.

Expected Behavior

1. The exported WebGL file should use UTF-8 encoding, matching the declared charset in the HTML.
2. The export process for WebGL files should be optimized to reduce the export time to a more reasonable duration.

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