diff --git a/rtdata/themes/RawTherapee-GTK3-20_.css b/rtdata/themes/RawTherapee-GTK3-20_.css
index cc533320b..3f25ce509 100644
--- a/rtdata/themes/RawTherapee-GTK3-20_.css
+++ b/rtdata/themes/RawTherapee-GTK3-20_.css
@@ -18,19 +18,24 @@
   along with RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-/* Scrollbar stuck workaround */
-scrollbar:not(.overlay-indicator):hover {
-    min-width: 1px;
-}
+/* text-shadow causes a serious performance degradation in rendering the UI,
+ * at least in comboboxes with many entries (i.e. Profiled Lens Correction).
+*/
 
 * {
     color: #AAAAAA;
+    text-shadow: none;
 }
 
 *:disabled {
     color: #666666;
 }
 
+/* Scrollbar stuck workaround */
+scrollbar:not(.overlay-indicator):hover {
+    min-width: 1px;
+}
+
 .view:selected:not(check):not(radio) {
     color: #262626;
     background-color: #AAAAAA