diff --git a/test/twin/openai/src/debug_ui.rs b/test/twin/openai/src/debug_ui.rs
index 97ea3c90c..8c760d499 100644
--- a/test/twin/openai/src/debug_ui.rs
+++ b/test/twin/openai/src/debug_ui.rs
@@ -371,7 +371,9 @@ async function refresh() {
   } catch(e) { /* silent -- next interval will retry */ }
 }
 
-setInterval(refresh, 2000);
+if (new URLSearchParams(window.location.search).get('refresh') !== '0') {
+  setInterval(refresh, 2000);
+}
 
 function renderState(data) {
   if (data.namespaces.length === 0) {
diff --git a/test/twin/openai/tests/debug_ui.rs b/test/twin/openai/tests/debug_ui.rs
index bae437792..bef6ccc64 100644
--- a/test/twin/openai/tests/debug_ui.rs
+++ b/test/twin/openai/tests/debug_ui.rs
@@ -313,7 +313,10 @@ async fn debug_page_renders_in_headless_chrome() {
         command.arg("--no-sandbox");
     }
     let output = command
-        .arg(format!("{}/__debug", server.base_url))
+        // Static mode keeps the page visually identical for the screenshot
+        // while avoiding a live refresh loop that can stall headless Chrome
+        // on Linux CI.
+        .arg(format!("{}/__debug?refresh=0", server.base_url))
         .output()
         .expect("Chrome should run");