1

Usually it is recommended to either use GTK or Qt apps in the operating system, but not mixing them both together.

Example:

When using KDE it seems to be obvious to use KMail (Qt) instead of Thunderbird (GTK).

Or: When using Gnome it is recommended to use Thunderbird instead of KMail.


My question is: Are there any disadvantages in relation to CPU efficiency/task handling speed when mixing up both application types?

  • 2
    No, it absolutely doesn't matter. You can run multiple Gtk or Qt apps even on older machines, but KDE or Gnome monsters + their respective ecosystems are each capable to bring a machine to its knees on their own ;-) – mosvy Sep 5 '19 at 21:10
  • i agree that GTK vs QT doesn't matter. It will be Gnome or KDE that brings the system to a crawl. – ron Sep 6 '19 at 1:24
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    Related on Ask Ubuntu: Is it bad to have Qt apps on a GTK environment?, which was asked and then closed in 2016--I wrote a long answer over there to demystify the issue; no benchmark to prove though. – clearkimura Sep 6 '19 at 9:28
2

It will use more RAM and cache, because of the extra libraries. This will cause a slow down (more swapping, if RAM is low; more cache misses). However you will probably not notice.

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