Dear ConTeXt Devs, Here's a problem that I reported last year ( https://mailman.ntg.nl/pipermail/ntg-context/2020/099862.html) with a wrong description. I thought that it had something to do with Firefox or browsers, but it turns out to be a much deeper and weirder problem messing up with the X window system. Environment: Manjaro Linux 21.1.2, Xfce 4.16 Steps to reproduce: 1. `context --version` # it can hardly be any more innocent 2.1. keep striking random keys in the terminal or mounsepad or whatever 2.2. or open a running-cat.gif in the background Expected behavior: the characters should appear as you type, or the cat should keep running Actual behavior: ~3s after `context --version` finishes, the terminal freezes and the character stops appearing for ~1s, or similarly, the cat stops running for ~1s In short, ~3s upon termination of context, the X window stuck for ~1s. More information: 1. The problem only appears 2 days after the fresh installation of latest context-lmtx, which was also the case last year. 2. `context --version` isn't doing anything, so it shouldn't be a resource problem, and I've got no such problem keeping 40+ pages open in chrome anyway. 3. Below is a more precise timing of the problem. The first output is the result of `context --version` along with the start and stop timestamps. The second output is a python one-liner printing timestamps each time it reads an <enter>. Notice how python reads an <enter> per ~0.05s until 00:33:21.597326, when it is blocked for ~0.7s. I'm not sure if it's reproducible everywhere, and I'm willing to debug it myself, but I would need the source code of the context executable. Thanks! Best, Sylvain $ date +'%H:%M:%S.%N'; context --version; date +'%H:%M:%S.%N' 00:33:18.885305966 mtx-context | ConTeXt Process Management 1.04 mtx-context | mtx-context | main context file: /home/exprosic/apps/context-lmtx/tex/texmf-context/tex/context/base/mkiv/context.mkiv mtx-context | current version: 2021.09.06 11:47 mtx-context | main context file: /home/exprosic/apps/context-lmtx/tex/texmf-context/tex/context/base/mkxl/context.mkxl mtx-context | current version: 2021.09.06 11:47 00:33:18.969962042 $ python

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while input() or True: print(datetime.now()) ... 2021-09-12 00:33:19.232685 2021-09-12 00:33:19.732828 2021-09-12 00:33:19.783645 2021-09-12 00:33:19.833808 (~0.05s per line, omitted 30 lines) 2021-09-12 00:33:21.394246 2021-09-12 00:33:21.445061 2021-09-12 00:33:21.496275 2021-09-12 00:33:21.546402 2021-09-12 00:33:21.597326 <--- ~0.05s per event until here 2021-09-12 00:33:21.646603 <--- stuck for 0.7s 2021-09-12 00:33:22.366133 <--- the stucked events flush in 2021-09-12 00:33:22.366269 2021-09-12 00:33:22.369491 2021-09-12 00:33:22.369765 2021-09-12 00:33:22.372800 2021-09-12 00:33:22.373038 2021-09-12 00:33:22.376233 2021-09-12 00:33:22.376444 2021-09-12 00:33:22.379487 2021-09-12 00:33:22.379687 2021-09-12 00:33:22.382737 2021-09-12 00:33:22.382960 2021-09-12 00:33:22.386020 2021-09-12 00:33:22.386253 2021-09-12 00:33:22.400795 <--- recovers ~0.05s per event 2021-09-12 00:33:22.451349 2021-09-12 00:33:22.503352 2021-09-12 00:33:22.553715 ....