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Below I have posted the code I use for drawing pictures. The problem is that when I want to generate more images in full hd size (in loop), the generation time increases significantly. Can somehow optimize my code to speed it up a lot?

 Bitmap bmp = new Bitmap(imageMask.Width, imageMask.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
 bmp.MakeTransparent();
 Bitmap bmpLevel = new Bitmap(imageMask.Width, imageMask.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
 using (Graphics g = Graphics.FromImage(bmpLevel))
 {
 int rectX = levelX.Value;
 int rectY = levelY.Value + levelHeight.Value - valproc;
 int rectWidth = levelWidth.Value;
 int rectHeight = valproc;
 g.FillRectangle(new SolidBrush(levelColor), rectX, rectY, rectWidth, rectHeight);
 g.DrawImage(imageMask, new Rectangle(0, 0, bmpLevel.Width, bmpLevel.Height), new Rectangle(0, 0, imageMask.Width, imageMask.Height), GraphicsUnit.Pixel);
 }
 bmpLevel.MakeTransparent(Color.Black);
 Bitmap contour = new Bitmap(imageMaskCountour.Width, imageMaskCountour.Height, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
 contour.MakeTransparent();
 using (Graphics g = Graphics.FromImage(contour))
 {
 g.FillRectangle(ContourBrush, 0, 0, contour.Width, contour.Height);
 g.DrawImage(imageMaskCountour, new Rectangle(0, 0, contour.Width, contour.Height), new Rectangle(0, 0, imageMaskCountour.Width, imageMaskCountour.Height), GraphicsUnit.Pixel);
 }
 contour.MakeTransparent(Color.Black);
 bmp.MakeTransparent(Color.Black);
 using (Graphics g = Graphics.FromImage(bmp))
 {
 g.DrawImage(contour, new Rectangle(0, 0, bmp.Width, bmp.Height), new Rectangle(0, 0, contour.Width, contour.Height), GraphicsUnit.Pixel);
 g.DrawImage(bmpLevel, new Rectangle(0, 0, bmp.Width, bmp.Height), new Rectangle(0, 0, bmpLevel.Width, bmpLevel.Height), GraphicsUnit.Pixel);
 }
 if (this.HiHiLevel.HasValue)
 {
 using (Graphics g = Graphics.FromImage(bmp))
 {
 int alarmlevel = (int)(((double)this.HiHiLevel.Value / 100.0) * (double)levelHeight);
 int x = levelX.Value;
 int y = levelY.Value + levelHeight.Value - alarmlevel;
 Pen drawPen = new Pen(Color.Red, 2);
 g.DrawLine(drawPen, new Point(x, y + 5), new Point(x + levelWidth.Value, y + 5));
 }
 }
 if (this.HiLevel.HasValue)
 {
 using (Graphics g = Graphics.FromImage(bmp))
 {
 int alarmlevel = (int)(((double)this.HiLevel.Value / 100.0) * (double)levelHeight);
 int x = levelX.Value;
 int y = levelY.Value + levelHeight.Value - alarmlevel;
 Pen drawPen = new Pen(Color.Yellow, 2);
 g.DrawLine(drawPen, new Point(x, y + 5), new Point(x + levelWidth.Value, y + 5));
 }
 }
 if (this.LoLevel.HasValue)
 {
 using (Graphics g = Graphics.FromImage(bmp))
 {
 int alarmlevel = (int)(((double)this.LoLevel.Value / 100.0) * (double)levelHeight);
 int x = levelX.Value;
 int y = levelY.Value + levelHeight.Value - alarmlevel;
 Pen drawPen = new Pen(Color.Yellow, 2);
 g.DrawLine(drawPen, new Point(x, y + 5), new Point(x + levelWidth.Value, y + 5));
 }
 }
 if (this.LoLoLevel.HasValue)
 {
 using (Graphics g = Graphics.FromImage(bmp))
 {
 int alarmlevel = (int)(((double)this.LoLoLevel.Value / 100.0) * (double)levelHeight);
 int x = levelX.Value;
 int y = levelY.Value + levelHeight.Value - alarmlevel;
 Pen drawPen = new Pen(Color.Red, 2);
 g.DrawLine(drawPen, new Point(x, y + 5), new Point(x + levelWidth.Value, y + 5));
 }
 }
 using (System.IO.MemoryStream msItem = new System.IO.MemoryStream())
 {
 bmp.Save(msItem, System.Drawing.Imaging.ImageFormat.Png);
 Schema = msItem.ToArray();
 }