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I use it with "Compiled bindings" (https://docs.avaloniaui.net/docs/basics/data/data-binding/co...) and it feels instant to me too (on a I7-8750H).

Without this option, bindings use Reflection and it can be quite slow.

What app are you starting?

For me it feels instant. Like opening sublime text. Faster than opening VS Code..

Rather than assume someone is lying, maybe look for what another explanation might be.