4.4 Preview and 4.3.1 extremly slow

Development Programming & Scripting C++
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1

Hello,

I have the following piece of code:

for (int32 x = 0; x < GridSize.width; x++)
	{

		grid.Add(UBSPGridRow());
		for (int32 y = 0; y < GridSize.height; y++)
		{
			FActorSpawnParameters SpawnParams;
			SpawnParams.Owner = this;
			SpawnParams.Instigator = Instigator;

			FVector SpawnVector;

			SpawnVector.Y = this->GetActorLocation().Y + x * 96.0f - 96.0f;
			SpawnVector.X = this->GetActorLocation().X + y * 96.0f;
			SpawnVector.Z = this->GetActorLocation().Z;

			ABSPLevelCell* cell = world->SpawnActor<ABSPLevelCell>(SpawnVector, FRotator(0, 0, 0), SpawnParams);
			UGameplayStatics::FinishSpawningActor(cell, FTransform());
			double random = ((double)rand() / (RAND_MAX));
			cell->Type = ABSPLevelCell::LevelCellTypeWall;
			cell->GridCoordinate = FVector2D(x, y);
			cell->AttachRootComponentToActor(this);
			grid[x].columns.Add(cell);
		}

	}

This code runs in about 0.2 secconds in 4.2.1 on my MacBook Pro. Now on 4.4 Preview and 4.3.1 this takes about 10 minutes. So it is about 200 times slower than 4.2.1. Why that? Also when running it uses up to 2 gig of ram now and 100% cpu.

Greetings,