diff --git a/script.html b/script.html
index cbd5f97..7bddb0a 100644
--- a/script.html
+++ b/script.html
@@ -507,12 +507,54 @@ async function bindFilm(p) {
 
 function bindPost() {
   var sb = document.getElementById("seams");
+  function paintSeams(r) {
+    var el = document.getElementById("seamout");
+    if (!el) return;
+    el.innerHTML = '<p class="foot" style="margin:0 0 8px">' + esc(r.status_text || "") + '</p>'
+      + (r.seams || []).map(function (x) {
+          var col = x.verdict === "smooth" ? "var(--good)"
+                  : (x.verdict === "visible" ? "var(--accent2)" : "var(--bad)");
+          return '<div class="foot" style="padding:6px 0;border-top:1px solid var(--line)">'
+            + 'shot ' + x.after_shot + ' → ' + x.before_shot + ' at ' + x.at_seconds + 's · '
+            + 'shift ' + x.shift_x + ',' + x.shift_y + ' · drift ' + x.drift + ' · '
+            + '<span style="color:' + col + '">' + esc(x.verdict) + '</span>'
+            + (x.recommend_broll ? ' · worth a cutaway' : '')
+            + '</div>';
+        }).join("");
+  }
+
   if (sb) sb.onclick = async function () {
     sb.disabled = true; sb.textContent = "Measuring…";
-    var r = await api("seam_report", { email: email, project_id: pid });
-    sb.disabled = false; sb.textContent = "Measure the joins";
     var el = document.getElementById("seamout");
-    if (!r.ok) { showMsg("msg", r.error || "Could not measure."); return; }
+    var r = await api("seam_report", { email: email, project_id: pid });
+    if (!r.ok) {
+      sb.disabled = false; sb.textContent = "Measure the joins";
+      showMsg("msg", r.error || "Could not measure.");
+      return;
+    }
+    // Measuring downloads every shot and searches each join for the best
+    // alignment, which is far too slow to answer inside one request.
+    if (r.pending) {
+      el.innerHTML = '<p class="foot">' + esc(r.status_text || "Measuring…") + '</p>';
+      var waited = 0;
+      var t = setInterval(async function () {
+        waited += 4;
+        var g = await api("seam_report", { email: email, project_id: pid });
+        if (g.ok && !g.pending) {
+          clearInterval(t);
+          sb.disabled = false; sb.textContent = "Measure the joins";
+          paintSeams(g);
+          return;
+        }
+        if (waited > 180) {
+          clearInterval(t);
+          sb.disabled = false; sb.textContent = "Measure the joins";
+          showMsg("msg", "Measuring is taking unusually long.");
+        }
+      }, 4000);
+      return;
+    }
+    sb.disabled = false; sb.textContent = "Measure the joins";
     if (!r.seams || !r.seams.length) {
       el.innerHTML = '<p class="foot">' + esc(r.status_text || "Nothing to measure.") + '</p>';
       return;