Personally I see “Written in rust” as more of a meme, often using buzzwords like “blazing fast” and “memory safe.” Electron is definitely worse than rust is good.
So have you measured it or do you just mean you haven't implemented as many features? -> Usually the latter.
1. Speed is usually found by by people have worked on
existing tools in the space, and they don't often make
that much of a song and dance about it beyond that
theirs is faster.
2. Speed is found in the minds of people not in their
tools. When you get past a certain amount of native-
ness, you get optimizations by knowing more or having
a brilliant insight into the problem rather than using
a new meme-language. It might be necessary for certain
types of programming but it's not sufficient.
To your point, many of the improvements from Rust-based tools appears to come from the ability to express performant semantics safely and elegantly in the language. You could write an equivalent in C, but the Rust one comes naturally, can be expressed at a higher level with better abstractions, and often comes out with top-tier performance before even investing in microoptimizarions (as long as the Big-O performance is in check).
But as soon as you get into consumer software with auto-update mechanisms and an expectation that end users won’t be computer professionals who know how to read a CVE and evaluate its urgency, the “written in Rust” distinction becomes a mostly irrelevant implementation detail. Or, worse, it’s an indication that the GUI will feel wrong in some way because the Rust community seems averse to writing GUIs with GTK, UI Kit and whatever the hell Microsoft recommends using for Windows these days.
I would say, it depends very much on the developer. There are probably only a handful of people, who can write a fast GUI in C/++ that is also safe, plattform independent - and a joy to use.
(I am definitely not among them)
But there are a ton of devs, knowing how to accomplish it - with the webtoolkit.
In other words, I indeed would prefer a electron app, over some hacked together GUI in a "performant" language. Security, performance - and UX wise.
People rag on Electron with the same shallowness as they praise Rust. I bet you can make slow things in Rust. It's all a soup of trade-offs, resource management and hype.