Comment 2 for bug 1847926

I *think* this is resolved in xfce4-diskperf-plugin 2.7.0:
https://gitlab.xfce.org/panel-plugins/xfce4-diskperf-plugin/-/blob/master/NEWS

2.7.0 (2022-03-03)
=====
- Enable high-frequency tooltip updates
- Remove rounding to multiples of 5 MiB/s
- Change default maximum I/O bandwidth from 40 MiB/s to 1024 MiB/s
- Adjust tooltip spacing
- Update and sort the list of authors
- Bump required GTK+ version to 3.16
- Update README
- Reformat copyright notices
- Update configuration files
- Fix compilation warnings
- Code cleanups
- Translation Updates:
  Albanian, Arabic, Armenian (Armenia), Basque, Belarusian, Bulgarian,
  Catalan, Chinese (China), Chinese (Taiwan), Croatian, Czech, Danish,
  Dutch, Eastern Armenian, English (Australia), English (Canada),
  English (United Kingdom), French, Galician, German, Greek, Hebrew,
  Hungarian, Icelandic, Indonesian, Italian, Japanese, Korean, Latvian,
  Lithuanian, Malay, Norwegian Bokmål, Occitan (post 1500), Panjabi
  (Punjabi), Polish, Portuguese, Portuguese (Brazil), Russian, Serbian,
  Slovak, Slovenian, Spanish, Swedish, Thai, Turkish, Ukrainian, Urdu,
  Urdu (Pakistan), Uyghur