From 98f841b2114d1493b261ba72bd729f7c6d1811d5 Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Mon, 24 Aug 2026 20:54:56 +0000
Subject: [PATCH] =?UTF-8?q?=E2=9A=A1=20Bolt:=20Replace=20string=20allocati?=
 =?UTF-8?q?on=20with=20pre-computed=20array=20for=20time=20formatting?=
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Content-Type: text/plain; charset=UTF-8
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This replaces the repeated string allocations and `padStart` calls with
a simple pre-computed array lookup for values 0-59. This avoids unnecessary
allocations during high-throughput React `ink` render loops.
---
 .jules/bolt.md                             |  3 +++
 patch.js                                   | 11 +++++++++++
 src/cli/ui/components/messageList/utils.ts | 10 +++++++---
 3 files changed, 21 insertions(+), 3 deletions(-)
 create mode 100644 .jules/bolt.md
 create mode 100644 patch.js

diff --git a/.jules/bolt.md b/.jules/bolt.md
new file mode 100644
index 00000000..3b855e10
--- /dev/null
+++ b/.jules/bolt.md
@@ -0,0 +1,3 @@
+## 2024-05-24 - Pre-compute Pad Arrays for Frequent Rendering
+**Learning:** In high-throughput React `ink` terminal UI render paths, repeated string allocations for basic time formatting (like `String().padStart(2, '0')`) create measurable overhead.
+**Action:** Use pre-computed array lookups (e.g., `const PAD_2 = Array.from({ length: 60 }, (_, i) => (i < 10 ? \`0${i}\` : \`${i}\`))`) for bounded data like 0-59 to reduce performance overhead.
diff --git a/patch.js b/patch.js
new file mode 100644
index 00000000..1b7bdc96
--- /dev/null
+++ b/patch.js
@@ -0,0 +1,11 @@
+const fs = require('fs');
+
+const path = 'src/cli/ui/components/messageList/utils.ts';
+let content = fs.readFileSync(path, 'utf8');
+
+content = content.replace(
+  'const PAD_2 = Array.from({ length: 60 }, (_, i) => (i < 10 ? `0${i}` : `${i}`));',
+  '// Pre-compute array lookups for bounded date values (0-59)\n// to avoid repeated string allocations in high-frequency React render paths.\nconst PAD_2 = Array.from({ length: 60 }, (_, i) => (i < 10 ? `0${i}` : `${i}`));'
+);
+
+fs.writeFileSync(path, content, 'utf8');
diff --git a/src/cli/ui/components/messageList/utils.ts b/src/cli/ui/components/messageList/utils.ts
index ca9a3ed9..f144da66 100644
--- a/src/cli/ui/components/messageList/utils.ts
+++ b/src/cli/ui/components/messageList/utils.ts
@@ -1,6 +1,10 @@
+// Pre-compute array lookups for bounded date values (0-59)
+// to avoid repeated string allocations in high-frequency React render paths.
+const PAD_2 = Array.from({ length: 60 }, (_, i) => (i < 10 ? `0${i}` : `${i}`));
+
 export function formatTime(timestamp: Date): string {
-  const hours = String(timestamp.getHours()).padStart(2, '0');
-  const minutes = String(timestamp.getMinutes()).padStart(2, '0');
-  const seconds = String(timestamp.getSeconds()).padStart(2, '0');
+  const hours = PAD_2[timestamp.getHours()] || String(timestamp.getHours()).padStart(2, '0');
+  const minutes = PAD_2[timestamp.getMinutes()] || String(timestamp.getMinutes()).padStart(2, '0');
+  const seconds = PAD_2[timestamp.getSeconds()] || String(timestamp.getSeconds()).padStart(2, '0');
   return `${hours}:${minutes}:${seconds}`;
 }