Hacker News Reader

Can you link us to one, so we can do independent tests with it, please?

For example the Modula-3 reference manual, 100 pages, when scrolling with the mouse, pages can take more than 1s to render on a i7 system.

With native readers, it is almost instantaneous.

Unable to reproduce on a 2.6GHz Core i7. It's slower than the viewer in Chrome, to be sure, but not to the degree you describe.