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Visit https://data.gov.tw/dataset/34315 . 2. Download e.g., B=E8=87=BA=E4=B8=AD=E5=B8=82 . 3. Unzip, and open one of the more whopping XML files, $ ls -ogS Downloads/B_XML/ | head -n 5 -rw-r--r-- 1 3091875 2020-04-13 b_4602.xml -rw-r--r-- 1 3087978 2020-04-13 b_0755.xml -rw-r--r-- 1 2874539 2020-04-13 b_5709.xml -rw-r--r-- 1 2829385 2020-04-13 b_0530.xml Press M-> [end-of-buffer]. Now press M-<. You'll see the combination of one very long line, UTF-8 tags (<=E5=9C=8B=E6= =9C=89>), etc. causes emacs to, well, only be able to process C-g's and beep. Before long one can only put it out of its misery with $ killall -1 emacs. emacs-version "27.1"