diff --git a/config-programming.org b/config-programming.org
index 7a172a7..3bf86c2 100644
--- a/config-programming.org
+++ b/config-programming.org
@@ -59,9 +59,11 @@
     :hook
     (lsp-completion-mode . my/lsp-mode-setup-completion)
     :config
+    (require 'my-nprocs)
     (with-eval-after-load 'lsp-clangd
       (add-to-list 'lsp-clients-clangd-args
-                   "-j=16"))
+                   (format "-j=%d"
+                           (nprocs))))
 
     (setq lsp-clangd-binary-path
           (executable-find "clangd"))
diff --git a/lisp/llvm-lib/llvm-shared.el b/lisp/llvm-lib/llvm-shared.el
index 64454b4..ff731ca 100644
--- a/lisp/llvm-lib/llvm-shared.el
+++ b/lisp/llvm-lib/llvm-shared.el
@@ -28,14 +28,12 @@
 (require 'eieio)
 (require 'load-llvm-mode)
 (require 'my-clang-options)
+(require 'my-nprocs)
 
 ;; =========================== LLVM Rebuild ==========================
 
 (defvar llvm-core-count
-  (--> "nproc"
-       (shell-command-to-string it)
-       (string-to-number it)
-       (- it 16)))
+  (nprocs))
 
 (defun lls/ninja-build-tools (build-dir tools-list &optional verbose)
   (format "set -o pipefail && CLICOLOR_FORCE=1 ninja -C %s -j %d %s %s 2>&1 | tee ninja.log"
diff --git a/lisp/my-nprocs.el b/lisp/my-nprocs.el
new file mode 100644
index 0000000..d647e51
--- /dev/null
+++ b/lisp/my-nprocs.el
@@ -0,0 +1,41 @@
+;;; my-nprocs.el ---  -*- lexical-binding: t -*-
+
+;; Copyright (C) 2024 Benson Chu
+
+;; Author: Benson Chu <bensonchu457@gmail.com>
+;; Created: [2024-12-27 10:07]
+
+;; This file is not part of GNU Emacs
+
+;; This program is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;;; Code:
+(require 'dash)
+
+(defvar nprocs-cache nil)
+
+(defun nprocs ()
+  (or nprocs-cache
+      (setq nprocs-cache
+            (-->
+             (shell-command-to-string "nproc")
+             (string-to-number it)
+             (let ((num it))
+               (max (- num 16)
+                    (/ num 2)))))))
+
+(provide 'my-nprocs)
+;;; my-nprocs.el ends here