> I think it's okay for glyph generation to be slow as long as it doesn't block redraw and immediate user feedback such as scrolling Incidentally, last night I

> I think it's okay for glyph generation to be slow as long as it doesn't block redraw and immediate user feedback such as scrolling Incidentally, last night I loaded a page containing https://news.ycombinator.com/item?id=44061550 https://news.ycombinator.com/item?id=44061550 in Fennec on my phone, and at some point when I scrolled to where some superscripts were in view, they were briefly displayed as gray boxes. My inference is that Fennec had loaded the font metrics so it could do layout but didn't do glyph rasterization until the glyphs were in view or nearly so.