I haven't been able to do direct comparisons but they most likely have very similar performance. The major bottleneck with Electro at the moment (which will certainly be addressed on Electro (internal) v5.0 aka Electro Next) is the reliance on Tauri & WebView2.

As soon as I can port over core functionality to a custom desktop renderer things will go from being 10x faster (currently) to 1000x faster (the end goal).

I'm currently trying to balance Electro with: university final year, job applications, 2 other OSS projects I contribute to, and a friends' business website so these features will most likely take many months to get through. I'm hoping the eyes Electro has gained from this announcement will bring in some talent who know more about lower level image viewer functionality than I do so that they can help guide the project towards the ultimate performance-first tech stack!