diff --git a/src/Output/QRMarkupSVG.php b/src/Output/QRMarkupSVG.php
index 92815ebde..0dc586f16 100644
--- a/src/Output/QRMarkupSVG.php
+++ b/src/Output/QRMarkupSVG.php
@@ -28,6 +28,10 @@ class QRMarkupSVG extends QRMarkup{
 
 	final public const string MIME_TYPE = 'image/svg+xml';
 
+	// micro optimization for circle radius and diameter values in long loops
+	protected float $r;
+	protected float $d;
+
 	/**
 	 * @todo: XSS proof
 	 *
@@ -116,6 +120,9 @@ class QRMarkupSVG extends QRMarkup{
 	 * returns one or more SVG <path> elements
 	 */
 	protected function paths():string{
+		$this->r = $this->options->circleRadius;
+		$this->d = $this->r * 2;
+
 		$paths = $this->collectModules();
 		$svg   = [];
 
@@ -173,13 +180,11 @@ class QRMarkupSVG extends QRMarkup{
 
 		if($this->options->drawCircularModules && !$this->matrix->checkTypeIn($x, $y, $this->options->keepAsSquare)){
 			// string interpolation: ugly and fast
-			$r = $this->options->circleRadius;
-			$d = $r * 2;
-			$ix = ($x + 0.5 - $r);
+			$ix = ($x + 0.5 - $this->r);
 			$iy = ($y + 0.5);
 
 			// phpcs:ignore
-			return "M$ix $iy a$r $r 0 1 0 $d 0 a$r $r 0 1 0 -$d 0Z";
+			return "M$ix $iy a$this->r $this->r 0 1 0 $this->d 0 a$this->r $this->r 0 1 0 -$this->d 0Z";
 		}
 
 		// phpcs:ignore
diff --git a/src/Output/QROutputAbstract.php b/src/Output/QROutputAbstract.php
index c6ff3533a..86034bfc5 100644
--- a/src/Output/QROutputAbstract.php
+++ b/src/Output/QROutputAbstract.php
@@ -37,6 +37,13 @@ abstract class QROutputAbstract implements QROutputInterface{
 	 */
 	protected int $length;
 
+	/**
+	 * The current module scale value (might have been modified)
+	 *
+	 * @see \chillerlan\QRCode\QROptions::$scale
+	 */
+	protected int $scale;
+
 	/**
 	 * an (optional) array of color values for the several QR matrix parts
 	 *
@@ -54,13 +61,6 @@ abstract class QROutputAbstract implements QROutputInterface{
 	 */
 	protected SettingsContainerInterface|QROptions $options;
 
-	/**
-	 * The current module scale value (might have been modified)
-	 *
-	 * @see \chillerlan\QRCode\QROptions::$scale
-	 */
-	protected int $scale;
-
 	/**
 	 * QROutputAbstract constructor.
 	 */
@@ -84,7 +84,7 @@ abstract class QROutputAbstract implements QROutputInterface{
 	/**
 	 * Sets/updates the matrix dimensions
 	 *
-	 * Call this method if you modify the matrix from within your custom module in case the dimensions have been changed
+	 * Call this method if you modify the matrix from within your custom output class in case the dimensions have been changed
 	 */
 	protected function setMatrixDimensions():void{
 		$this->moduleCount = $this->matrix->moduleCount;
diff --git a/src/QROptionsTrait.php b/src/QROptionsTrait.php
index 396f9b06e..60743de71 100644
--- a/src/QROptionsTrait.php
+++ b/src/QROptionsTrait.php
@@ -112,7 +112,7 @@ trait QROptionsTrait{
 	}
 
 	/**
-	 * Mask Pattern to use (no value in using, mostly for unit testing purposes)
+	 * Mask Pattern to use (no value in using, mostly for unit testing purposes, will cause unreadable symbols)
 	 *
 	 * `0 ... 7` or `MaskPattern::PATTERN_AUTO` (default)
 	 *
@@ -150,7 +150,7 @@ trait QROptionsTrait{
 	/**
 	 * Return the image resource instead of a render if applicable.
 	 *
-	 * - `QRGdImage`: `resource` (PHP < 8), `GdImage`
+	 * - `QRGdImage`: `GdImage`
 	 * - `QRImagick`: `Imagick`
 	 * - `QRFpdf`:    `FPDF`
 	 *