diff --git a/static/index.html b/static/index.html
index d2b0fd8..53653f5 100644
--- a/static/index.html
+++ b/static/index.html
@@ -2851,7 +2851,9 @@
 
     function _barcodeOptions() {
       return {
-        delayBetweenScanAttempts: 50,   // scan every 50ms (was default ~500ms)
+        delayBetweenScanAttempts: 300,  // scan every 300ms (was 50ms — too fast
+                                        // for TRY_HARDER with 13 formats, caused
+                                        // decoder thrashing and missed barcodes)
         delayBetweenScanSuccess: 2000,  // 2s cooldown after a successful scan
       };
     }