Mh, nowadays, Gnome devs decided to have gdkpixbuf2 (image loader library) use the reimplementation glycin and that one use sandboxing via a bubblewrap process instead of kernel sandboxing, because they're too lazy to learn it (ignorant as always).
So XFCE has currently a bug, where each.single.texture causes one bubblewrap+dbus process to spawn (usually around 20 each), so that might cause higher CPU load on already struggling hardware. Unless you're on Arch, where you can install the "-noglycin" variant of gdkpixbuf2 and librsvg, but that's only a temporary workaround until glycin gets pushed as default.

Tl;dr: better go with a lightweight qt-based desktop currently.

And @gnome devs; pushing some major infrastructure (because you make it convenient) and then caring only for yourself, is why the world hates the US.