That is a surprising use case about Go and Electron (!), I would have imagined no contest for the superior performance of a compiled language, even with garbage collection. But the mention of "bindings for native UI frameworks", it was probably running the compiled code in a very tight loop, stressing the runtime. In contrast, Chromium specializes in UI with years of optimization.

Recently for a specific purpose I was reviewing options including Tauri, various WebView bindings, and in the end had to admit that Electron is probably the best approach in terms of feature set, development speed, etc.