How are graphics supposed to look like?

I found a thread about sluggishness here:

it would be the appropriate place to continue this discussion.

Here’s a quick but dirty way to fix the issue : Qt support for pdf can be ignored this way :

In Plugins/Qt/qt_utilities.cpp, in the qt_supports function, add

if (suffix(u) == "pdf")
    return false;

at the beginning.

Ghostscript is then in invoked to rasterize the pdf file for rendering.
And, at least for me, it doesn’t hurt pdf export (stays vectorial in an exported pdf).

Would it be relevant for this to be an option in the preference dialog ?

Before / after :