Hello, I'm using
Org-mode version 8.3.4 (release_8.3.4-1034-gadcaf9 @ /home/hs/.emacs.d/git/org-mode/lisp/) on emacs 25.1/25.2. With this version (also newer versions) I have a problem with loading files. I normally switch all files with extensions ".org" and also ".txt" to org-mode, even if the files are not a normal org file. This was no problem in the past. The problem happens on Linux and also on Windows (but more slow then on Linux). With current version it is a performance problem if the file contains following lines: 1111111111.222222 3 [xxxxxx_xxx]<0xffff> <<<XX-XXXXXXXXXX>>> XX X XXXX XX XXXX XX->XX Data(hex): ff => 04 The content is from a log file and the problematic content is the "<<<XX-XXXXXXXXXX>>>" part. (If I change the "<<<", ">>>" to "<<", ">>" the loading time in org-mode is ok.) If I have a file with around 160 lines as above and switch this file from fundamental-mode to org-mode it costs several seconds. A file with around 400K containing much of this lines costs minutes. I made an elp-instrumented measurement and the problematic part seems to be org-element-object-lex which called around 25760 times for the 160 lines file. With a bigger file it is much more. org-mode 1 1.089653152 1.089653152 org-update-radio-target-regexp 1 1.073683384 1.073683384 org-element-context 160 1.071594578 0.0066974661 org-element--object-lex 25760 0.9774005559 3.794...e-05 org-element-radio-target-parser 12880 0.2644946760 2.053...e-05 org-element-subscript-parser 12880 0.1016634290 7.893...e-06 org-element-link-parser 12880 0.0978871550 7.599...e-06 org-element-verbatim-parser 12720 0.0708337510 5.568...e-06 org-element-at-point 160 0.0616519250 0.0003853245 org-element--parse-to 160 0.0577311660 0.0003608197 org-element--current-element 160 0.0327868739 0.0002049179 org-element-paragraph-parser 160 0.0264464149 0.0001652900 org-element-timestamp-parser 12880 0.0113777200 8.833...e-07 org-mode-reftex-setup 1 0.005703614 0.005703614 .. Question: Is there a bug in org-element or is this behaviour intended? With kind regards, Stefan -- Stefan-W. Hahn It is easy to make things. It is hard to make things simple.