During that time IE startup time went from a dozen or so seconds to also instantaneous. It was even faster than chrome sometimes. But that was just the startup. The application wasn’t ready to accept any user input or load anything for another 10 or 15 seconds still. Sometimes it would even accept input for a second then block the input fields again.

It’s the same mentality all those insanely slow webapps do when they think some core react feature for a “initial render” or splash screen etc will save them from their horrific engineering practices.