; Document problems caused by validation of *.eln files on macOS

* etc/PROBLEMS: Document slowdown on macOS caused by the OS
validation of *.eln files.

etc/PROBLEMS

@@ -3646,6 +3646,38 @@ file; for example:
       "/usr/local/opt/libgccjit/lib/gcc/11"
       "/usr/local/opt/gcc/lib/gcc/11/gcc/x86_64-apple-darwin20/11.2.0") ":"))
 
+** Stuttering and missed keypresses during Native Compilation on macOS
+
+Natively compiled modules are validated by macOS the first time that
+they are loaded. On some machines, this can cause Emacs to be
+temporarily less responsive while large batches of modules are being
+compiled and loaded.
+
+One can force the first load of the module to happen in the async
+compilation worker by adding this to their early-init.el:
+
+(setq native-comp-async-env-modifier-form
+      '(progn
+         (defun c/native-comp--preload-eln-after-compile
+             (compile function-or-file &optional with-late-load output)
+           "Preload async native-comp output in the compiler child."
+           (prog1 (funcall compile function-or-file with-late-load output)
+             (when (and (stringp function-or-file) with-late-load)
+               (with-demoted-errors "Async native .eln preload: %S"
+                 (let ((eln-file (comp-el-to-eln-filename function-or-file)))
+                   (when (file-exists-p eln-file)
+                     (native-elisp-load eln-file t)))))))
+
+         (advice-add 'comp--native-compile
+                     :around #'c/native-comp--preload-eln-after-compile)))
+
+Alternatively, if one is willing to accept the associated security
+risks, one could disable library validation on their Emacs binary:
+
+codesign --force --sign - \
+    --entitlements macos-disable-library-validation.entitlements \
+    src/emacs
+
 ** Text dictation doesn't work on macOS
 
 The indication is that the macOS keyboard shortcut for dictation is ignored.