From f736116967f5b57d89978e51961f2e78eedb443b Mon Sep 17 00:00:00 2001
From: Adam <2363879+adamdotdevin@users.noreply.github.com>
Date: Fri, 27 Mar 2026 20:26:57 -0500
Subject: fix(app): more startup efficiency (#19454)

---
 packages/app/src/pages/session.tsx | 41 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

(limited to 'packages/app/src/pages')

diff --git a/packages/app/src/pages/session.tsx b/packages/app/src/pages/session.tsx
index 11e6375b3..917de35b1 100644
--- a/packages/app/src/pages/session.tsx
+++ b/packages/app/src/pages/session.tsx
@@ -544,6 +544,8 @@ export default function Page() {
   let reviewFrame: number | undefined
   let refreshFrame: number | undefined
   let refreshTimer: number | undefined
+  let todoFrame: number | undefined
+  let todoTimer: number | undefined
   let diffFrame: number | undefined
   let diffTimer: number | undefined
 
@@ -718,7 +720,6 @@ export default function Page() {
             if (!info) return true
             return Date.now() - info.at > SESSION_PREFETCH_TTL
           })()
-      const todos = untrack(() => sync.data.todo[id] !== undefined || globalSync.data.session_todo[id] !== undefined)
       untrack(() => {
         void sync.session.sync(id)
       })
@@ -730,13 +731,47 @@ export default function Page() {
           if (params.id !== id) return
           untrack(() => {
             if (stale) void sync.session.sync(id, { force: true })
-            void sync.session.todo(id, todos ? { force: true } : undefined)
           })
         }, 0)
       })
     }),
   )
 
+  createEffect(
+    on(
+      () => {
+        const id = params.id
+        return [
+          sdk.directory,
+          id,
+          id ? (sync.data.session_status[id]?.type ?? "idle") : "idle",
+          id ? composer.blocked() : false,
+        ] as const
+      },
+      ([dir, id, status, blocked]) => {
+        if (todoFrame !== undefined) cancelAnimationFrame(todoFrame)
+        if (todoTimer !== undefined) window.clearTimeout(todoTimer)
+        todoFrame = undefined
+        todoTimer = undefined
+        if (!id) return
+        if (status === "idle" && !blocked) return
+        const cached = untrack(() => sync.data.todo[id] !== undefined || globalSync.data.session_todo[id] !== undefined)
+
+        todoFrame = requestAnimationFrame(() => {
+          todoFrame = undefined
+          todoTimer = window.setTimeout(() => {
+            todoTimer = undefined
+            if (sdk.directory !== dir || params.id !== id) return
+            untrack(() => {
+              void sync.session.todo(id, cached ? { force: true } : undefined)
+            })
+          }, 0)
+        })
+      },
+      { defer: true },
+    ),
+  )
+
   createEffect(
     on(
       () => visibleUserMessages().at(-1)?.id,
@@ -1658,6 +1693,8 @@ export default function Page() {
     if (reviewFrame !== undefined) cancelAnimationFrame(reviewFrame)
     if (refreshFrame !== undefined) cancelAnimationFrame(refreshFrame)
     if (refreshTimer !== undefined) window.clearTimeout(refreshTimer)
+    if (todoFrame !== undefined) cancelAnimationFrame(todoFrame)
+    if (todoTimer !== undefined) window.clearTimeout(todoTimer)
     if (diffFrame !== undefined) cancelAnimationFrame(diffFrame)
     if (diffTimer !== undefined) window.clearTimeout(diffTimer)
     if (scrollStateFrame !== undefined) cancelAnimationFrame(scrollStateFrame)
-- 
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