If GP's system resources are usually dedicated to other tasks, perhaps trying to run an Electron app on top of those led to resource contention, and poor performance. You wouldn't notice this if your hardware is overprovisioned for the things you do with it.

Its overall a little sluggish in general (like most Electron apps though, in fairness) and occasionally clicking and dragging images onto the application will cause it to freeze and eventually crash.

Plus, the general usability issues present in all variants of the signal client (like no easy way of restoring previous messages on a new device).

It's not terrible or anything, but it's just a solid 6/10 application. I personally wish they were more open to 3rd party clients, so I could have something that integrates with my desktop environment a little better and is snappier, like my Matrix clients.