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Add a QGIS patch to speed up project loading with large project files #8133

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Merged
nirvn merged 1 commit into from
Oct 20, 2026
Merged

Add a QGIS patch to speed up project loading with large project files #8133

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1 change: 1 addition & 0 deletions vcpkg/ports/qgis/portfile.cmake
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ vcpkg_from_github(
processing.patch # Needed to avoid link issue with tinygltf (ATM embedded into QGIS) and _GEOSQueryCallback defined multiple times
mesh.patch
vector_tiles_dpi_fix.patch
project_load_optimization.patch
)


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62 changes: 62 additions & 0 deletions vcpkg/ports/qgis/project_load_optimization.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,62 @@
diff --git a/src/core/project/qgsproject.cpp b/src/core/project/qgsproject.cpp
index c2220801b7f..8df9e7157a8 100644
--- a/src/core/project/qgsproject.cpp
+++ b/src/core/project/qgsproject.cpp
@@ -2141,32 +2141,37 @@ bool QgsProject::readProjectFile( const QString &filename, Qgis::ProjectReadFlag
return false;
}

- QTextStream textStream( &projectFile );
- QString projectString = textStream.readAll();
- projectFile.close();
-
- for ( int i = 0; i < 32; i++ )
+ if ( !doc->setContent( &projectFile ) )
{
- if ( i == 9 || i == 10 || i == 13 )
+ projectFile.seek( 0 );
+ QTextStream textStream( &projectFile );
+ QString projectString = textStream.readAll();
+ projectFile.close();
+
+ for ( int i = 0; i < 32; i++ )
{
- continue;
+ if ( i == 9 || i == 10 || i == 13 )
+ {
+ continue;
+ }
+ projectString.replace( QChar( i ), u"%1%2%1"_s.arg( FONTMARKER_CHR_FIX, QString::number( i ) ) );
}
- projectString.replace( QChar( i ), u"%1%2%1"_s.arg( FONTMARKER_CHR_FIX, QString::number( i ) ) );
- }

- // location of problem associated with errorMsg
- int line, column;
- QString errorMsg;
- if ( !doc->setContent( projectString, &errorMsg, &line, &column ) )
- {
- const QString errorString = tr( "Project file read error in file %1: %2 at line %3 column %4" ).arg( projectFile.fileName(), errorMsg ).arg( line ).arg( column );
- QgsDebugError( errorString );
- setError( errorString );
+ int line, column;
+ QString errorMsg;
+ if ( !doc->setContent( projectString, &errorMsg, &line, &column ) )
+ {
+ const QString errorString = tr( "Project file read error in file %1: %2 at line %3 column %4" ).arg( projectFile.fileName(), errorMsg ).arg( line ).arg( column );
+ QgsDebugError( errorString );
+ setError( errorString );

- return false;
+ return false;
+ }
+ }
+ else
+ {
+ projectFile.close();
}
-
- projectFile.close();

QgsDebugMsgLevel( "Opened document " + projectFile.fileName(), 2 );

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