如图所示，尤其是在使用 pdf-tools 阅读体积较大的 PDF 文件时，频繁出现，我不知道哪里排查。
Emacs now supports double-buffering on MS-Windows to reduce display flicker. (This was supported on Free systems since Emacs 26.1.)
To disable double-buffering (e.g., if it causes display problems), set the frame parameter ‘inhibit-double-buffering’ to a non-nil value. You can do that either by adding
'(inhibit-double-buffering . t)
to ‘default-frame-alist’, or by modifying the frame parameters of the selected frame by evaluating
(modify-frame-parameters nil '((inhibit-double-buffering . t)))
试试这个变量呢