I rarely use Windows these days, but IrfanView feels lightning fast compared to the built-in Photos app or whatever they call it. I started using IV I think on Win 98 and it's still as snappy and reliable as it always has been.
And yes, at times it flickers and or images can tear.
I mean why would I? If all I need is viewing a couple of photos every now and then, cropping and rotating one or two and drawing some circles on them to highlight something in a screenshot and Windows already does that then why bother with Irfan other than habit and nostalgia.