diff --git a/openless-all/app/src-tauri/src/coordinator.rs b/openless-all/app/src-tauri/src/coordinator.rs
index c3a8ca22..9b00270f 100644
--- a/openless-all/app/src-tauri/src/coordinator.rs
+++ b/openless-all/app/src-tauri/src/coordinator.rs
@@ -2026,45 +2026,29 @@ fn should_try_non_tsf_insertion_fallback(
 fn insert_via_non_tsf_fallback(
     inner: &Arc<Inner>,
     polished: &str,
-    restore_clipboard: bool,
-    paste_shortcut: PasteShortcut,
+    _restore_clipboard: bool,
+    _paste_shortcut: PasteShortcut,
 ) -> InsertStatus {
-    let mut retried_unicode = false;
     let status = finish_non_tsf_insertion_fallback(
-        || {
-            inner.inserter.insert_via_clipboard_fallback(
-                polished,
-                restore_clipboard,
-                paste_shortcut,
-            )
-        },
-        || {
-            retried_unicode = true;
-            inner.inserter.insert_via_unicode_keystrokes(polished)
-        },
+        || inner.inserter.insert_via_unicode_keystrokes(polished),
+        || inner.inserter.copy_fallback(polished),
     );
 
-    if retried_unicode {
-        if status == InsertStatus::Inserted {
+    match status {
+        InsertStatus::Inserted => {
             log::warn!(
-                "[windows-ime] TSF unavailable; clipboard write failed, inserted via Unicode SendInput"
-            );
-        } else {
-            log::warn!(
-                "[windows-ime] TSF unavailable; clipboard write failed and Unicode SendInput fallback also failed"
+                "[windows-ime] TSF unavailable; inserted via paced Unicode SendInput fallback"
             );
         }
-    } else {
-        match status {
-            InsertStatus::PasteSent => {
-                log::info!("[windows-ime] TSF unavailable; attempted shortcut paste fallback");
-            }
-            InsertStatus::CopiedFallback => {
-                log::warn!(
-                    "[windows-ime] TSF unavailable; left text on clipboard, skipped Unicode SendInput retry"
-                );
-            }
-            InsertStatus::Inserted | InsertStatus::Failed => {}
+        InsertStatus::CopiedFallback => {
+            log::warn!(
+                "[windows-ime] TSF unavailable; Unicode SendInput failed, left text on clipboard"
+            );
+        }
+        InsertStatus::PasteSent | InsertStatus::Failed => {
+            log::warn!(
+                "[windows-ime] TSF unavailable; Unicode SendInput fallback failed and copy fallback failed"
+            );
         }
     }
 
@@ -2072,24 +2056,24 @@ fn insert_via_non_tsf_fallback(
 }
 
 #[cfg(any(target_os = "windows", test))]
-fn finish_non_tsf_insertion_fallback<C, U>(
-    mut clipboard_fallback: C,
+fn finish_non_tsf_insertion_fallback<U, C>(
     mut unicode_fallback: U,
+    mut copy_fallback: C,
 ) -> InsertStatus
 where
-    C: FnMut() -> InsertStatus,
     U: FnMut() -> InsertStatus,
+    C: FnMut() -> InsertStatus,
 {
-    match clipboard_fallback() {
-        InsertStatus::Failed => match unicode_fallback() {
-            InsertStatus::Inserted => InsertStatus::Inserted,
-            // 这里的 Unicode fallback 没有经过剪贴板复制；若它失败，不能再伪装成
-            // "已复制，请 Ctrl+V"。
-            InsertStatus::PasteSent | InsertStatus::CopiedFallback | InsertStatus::Failed => {
-                InsertStatus::Failed
+    match unicode_fallback() {
+        InsertStatus::Inserted => InsertStatus::Inserted,
+        InsertStatus::PasteSent | InsertStatus::CopiedFallback | InsertStatus::Failed => {
+            match copy_fallback() {
+                InsertStatus::CopiedFallback => InsertStatus::CopiedFallback,
+                InsertStatus::Inserted | InsertStatus::PasteSent | InsertStatus::Failed => {
+                    InsertStatus::Failed
+                }
             }
-        },
-        status => status,
+        }
     }
 }
 
@@ -2099,48 +2083,48 @@ mod non_tsf_fallback_tests {
     use crate::types::InsertStatus;
 
     #[test]
-    fn clipboard_copy_stops_before_unicode_retry() {
-        let mut unicode_called = false;
+    fn unicode_fallback_runs_before_copy_fallback() {
+        let mut copy_called = false;
         let status = finish_non_tsf_insertion_fallback(
-            || InsertStatus::CopiedFallback,
+            || InsertStatus::Inserted,
             || {
-                unicode_called = true;
-                InsertStatus::Inserted
-            },
-        );
-
-        assert_eq!(status, InsertStatus::CopiedFallback);
-        assert!(!unicode_called);
-    }
-
-    #[test]
-    fn unicode_retry_runs_only_after_clipboard_failure() {
-        let mut unicode_called = false;
-        let status = finish_non_tsf_insertion_fallback(
-            || InsertStatus::Failed,
-            || {
-                unicode_called = true;
-                InsertStatus::Inserted
-            },
-        );
-
-        assert_eq!(status, InsertStatus::Inserted);
-        assert!(unicode_called);
-    }
-
-    #[test]
-    fn double_failure_does_not_pretend_text_was_copied() {
-        let mut unicode_called = false;
-        let status = finish_non_tsf_insertion_fallback(
-            || InsertStatus::Failed,
-            || {
-                unicode_called = true;
+                copy_called = true;
                 InsertStatus::CopiedFallback
             },
         );
 
+        assert_eq!(status, InsertStatus::Inserted);
+        assert!(!copy_called);
+    }
+
+    #[test]
+    fn copy_fallback_runs_after_unicode_failure() {
+        let mut copy_called = false;
+        let status = finish_non_tsf_insertion_fallback(
+            || InsertStatus::Failed,
+            || {
+                copy_called = true;
+                InsertStatus::CopiedFallback
+            },
+        );
+
+        assert_eq!(status, InsertStatus::CopiedFallback);
+        assert!(copy_called);
+    }
+
+    #[test]
+    fn double_failure_does_not_pretend_text_was_copied() {
+        let mut copy_called = false;
+        let status = finish_non_tsf_insertion_fallback(
+            || InsertStatus::Failed,
+            || {
+                copy_called = true;
+                InsertStatus::Failed
+            },
+        );
+
         assert_eq!(status, InsertStatus::Failed);
-        assert!(unicode_called);
+        assert!(copy_called);
     }
 }
 
diff --git a/openless-all/app/src-tauri/src/insertion.rs b/openless-all/app/src-tauri/src/insertion.rs
index 9b1d6567..b5ca39b4 100644
--- a/openless-all/app/src-tauri/src/insertion.rs
+++ b/openless-all/app/src-tauri/src/insertion.rs
@@ -386,15 +386,30 @@ fn insertion_success_status() -> InsertStatus {
 
 #[cfg(target_os = "windows")]
 mod windows_unicode {
+    use std::time::Duration;
+
     use windows::Win32::UI::Input::KeyboardAndMouse::{
         SendInput, INPUT, INPUT_0, INPUT_KEYBOARD, KEYBDINPUT, KEYBD_EVENT_FLAGS, KEYEVENTF_KEYUP,
         KEYEVENTF_UNICODE, VIRTUAL_KEY,
     };
 
+    const SENDINPUT_CHUNK_CHARS: usize = 16;
+    const SENDINPUT_CHUNK_DELAY: Duration = Duration::from_millis(12);
+
     pub fn send_text(text: &str) -> Result<(), String> {
-        for unit in text.encode_utf16() {
-            send_utf16_unit(unit, false)?;
-            send_utf16_unit(unit, true)?;
+        let mut sent_in_chunk = 0usize;
+        let mut chars = text.chars().peekable();
+        while let Some(ch) = chars.next() {
+            let mut buf = [0u16; 2];
+            for unit in ch.encode_utf16(&mut buf) {
+                send_utf16_unit(*unit, false)?;
+                send_utf16_unit(*unit, true)?;
+            }
+            sent_in_chunk += 1;
+            if sent_in_chunk >= SENDINPUT_CHUNK_CHARS && chars.peek().is_some() {
+                std::thread::sleep(SENDINPUT_CHUNK_DELAY);
+                sent_in_chunk = 0;
+            }
         }
         Ok(())
     }
diff --git a/openless-all/app/src-tauri/src/types.rs b/openless-all/app/src-tauri/src/types.rs
index 737c479a..0feb78de 100644
--- a/openless-all/app/src-tauri/src/types.rs
+++ b/openless-all/app/src-tauri/src/types.rs
@@ -544,8 +544,8 @@ pub struct UserPreferences {
     /// 行为一致，不破坏既有用户。
     #[serde(default)]
     pub paste_shortcut: PasteShortcut,
-    /// Windows: 是否允许 TSF 失败后继续使用快捷键粘贴 / 剪贴板兜底。
-    /// 仅在剪贴板写入失败时才再试 Unicode SendInput，避免长文本注入卡顿。
+    /// Windows: 是否允许 TSF 失败后继续使用分批 Unicode SendInput / 剪贴板兜底。
+    /// Unicode SendInput 失败时才复制到剪贴板，避免文本丢失。
     /// 默认开启以保持可用性；关闭后可验证文本是否真正由 TSF 上屏。
     #[serde(default = "default_true")]
     pub allow_non_tsf_insertion_fallback: bool,
diff --git a/openless-all/app/src/i18n/en.ts b/openless-all/app/src/i18n/en.ts
index 943f9880..225a4537 100644
--- a/openless-all/app/src/i18n/en.ts
+++ b/openless-all/app/src/i18n/en.ts
@@ -546,7 +546,7 @@ export const en: typeof zhCN = {
       comboClear: 'Clear',
       comboConflict: 'This shortcut combination is not available',
       allowNonTsfFallbackLabel: 'Allow non-TSF fallback',
-      allowNonTsfFallbackDesc: 'Windows: when TSF insertion fails, try shortcut paste first; only fall back to Unicode SendInput if clipboard write fails.',
+      allowNonTsfFallbackDesc: 'Windows: when TSF insertion fails, use paced Unicode SendInput; if that still fails, copy the text to the clipboard.',
       historyGroupTitle: 'History & context',
       historyRetentionLabel: 'History retention (days)',
       historyRetentionDesc: 'Entries older than this are pruned on new writes; 0 = no time-based pruning.',
diff --git a/openless-all/app/src/i18n/ja.ts b/openless-all/app/src/i18n/ja.ts
index fa688a09..760baa83 100644
--- a/openless-all/app/src/i18n/ja.ts
+++ b/openless-all/app/src/i18n/ja.ts
@@ -548,7 +548,7 @@ export const ja: typeof zhCN = {
       comboClear: 'クリア',
       comboConflict: 'このショートカットの組み合わせは使用できません',
       allowNonTsfFallbackLabel: '非 TSF フォールバックを許可',
-      allowNonTsfFallbackDesc: 'Windows：TSF 入力が失敗した時は先にショートカット貼り付けを試し、クリップボード書き込みも失敗した時だけ Unicode SendInput に切り替えます。',
+      allowNonTsfFallbackDesc: 'Windows：TSF 入力が失敗した時は分割した Unicode SendInput を使い、それも失敗した場合はクリップボードへコピーします。',
       historyGroupTitle: '履歴とコンテキスト',
       historyRetentionLabel: '履歴保持期間（日）',
       historyRetentionDesc: '保持日数を超えた履歴は新規書き込み時に削除されます。0 = 時間で削除しない。',
diff --git a/openless-all/app/src/i18n/ko.ts b/openless-all/app/src/i18n/ko.ts
index 50304f3d..c6d4de87 100644
--- a/openless-all/app/src/i18n/ko.ts
+++ b/openless-all/app/src/i18n/ko.ts
@@ -548,7 +548,7 @@ export const ko: typeof zhCN = {
       comboClear: '지우기',
       comboConflict: '이 단축키 조합은 사용할 수 없습니다',
       allowNonTsfFallbackLabel: '비 TSF 폴백 허용',
-      allowNonTsfFallbackDesc: 'Windows: TSF 입력이 실패하면 먼저 단축키 붙여넣기를 시도하고, 클립보드 쓰기까지 실패한 경우에만 Unicode SendInput으로 전환.',
+      allowNonTsfFallbackDesc: 'Windows: TSF 입력이 실패하면 분할된 Unicode SendInput을 사용하고, 그래도 실패하면 텍스트를 클립보드에 복사합니다.',
       historyGroupTitle: '기록 및 컨텍스트',
       historyRetentionLabel: '기록 보관 기간(일)',
       historyRetentionDesc: '보관 기간을 초과한 기록은 새 항목 작성 시 정리됩니다. 0 = 시간 기반 정리 비활성화.',
diff --git a/openless-all/app/src/i18n/zh-CN.ts b/openless-all/app/src/i18n/zh-CN.ts
index 11b42ead..b32d04b2 100644
--- a/openless-all/app/src/i18n/zh-CN.ts
+++ b/openless-all/app/src/i18n/zh-CN.ts
@@ -544,7 +544,7 @@ export const zhCN = {
       comboClear: '清除',
       comboConflict: '该快捷键组合不可用',
       allowNonTsfFallbackLabel: '允许非 TSF 兜底',
-      allowNonTsfFallbackDesc: 'Windows：TSF 失败时先改用快捷键粘贴；剪贴板写入失败时才退到 Unicode SendInput。',
+      allowNonTsfFallbackDesc: 'Windows：TSF 失败时使用分批 Unicode SendInput；如果仍失败，再复制到剪贴板。',
       historyGroupTitle: '历史与上下文',
       historyRetentionLabel: '历史保留天数',
       historyRetentionDesc: '超过保留天数的历史在写入新条目时被清理；0 = 不按时间清理。',
diff --git a/openless-all/app/src/i18n/zh-TW.ts b/openless-all/app/src/i18n/zh-TW.ts
index 40e3334a..8f31b52e 100644
--- a/openless-all/app/src/i18n/zh-TW.ts
+++ b/openless-all/app/src/i18n/zh-TW.ts
@@ -546,7 +546,7 @@ export const zhTW: typeof zhCN = {
       pasteShortcutCtrlShiftV: 'Ctrl+Shift+V（kitty / alacritty / wezterm / 多數終端）',
       pasteShortcutShiftInsert: 'Shift+Insert（xterm / urxvt）',
       allowNonTsfFallbackLabel: '允許非 TSF 兜底',
-      allowNonTsfFallbackDesc: 'Windows：TSF 失敗時先改用快捷鍵貼上；剪貼簿寫入失敗時才退到 Unicode SendInput。',
+      allowNonTsfFallbackDesc: 'Windows：TSF 失敗時使用分批 Unicode SendInput；如果仍失敗，再複製到剪貼簿。',
       historyGroupTitle: '歷史與上下文',
       historyRetentionLabel: '歷史保留天數',
       historyRetentionDesc: '超過保留天數的歷史在寫入新條目時被清理；0 = 不按時間清理。',