i built an electron app for managing massive (millions) photo and video libraries. it took work and creativity (what technical problems dont) but its very performant. node is actually pretty good at io. that is to say electron itself wasnt your bottleneck, but rewriting in another language is pretext to write long form blog posts for seo and marketing purposes
sounds like you built a really useful app for working with large media libraries.
In our case, the bottleneck was related to how big the app was to start and how much we could optimize it to index media files for local AI search.
Interesting, do you have any write up on the app? What does your app do?