diff --git a/pd/nw/pdgui.js b/pd/nw/pdgui.js
index 637a62c49481951168429b0a134f09c89ff4f334..2dbe27402f4dd00c1dfa4b0211b25bf46ae79290 100644
--- a/pd/nw/pdgui.js
+++ b/pd/nw/pdgui.js
@@ -1442,7 +1442,7 @@ function gui_highlight_io(cid, tag) {
                  {"stroke-width":"7"},
                  {"stroke-width":"3"},
                 ],
-                { duration: 400,
+                { duration: 600,
                   delay: 45,
                   iterations: Infinity,
                   easing: "ease-in-out" }