REBOL [ title: "1 million rows grid - simplest" date: 11-mar-2017 file: %1-million-rows-grid1.r author: Nick Antonaccio purpose: { Simplest demo of grid data display, using VID's 'list style See http://re-bol.com/grid-list.r for more features } ] sp: 0 repeat i 1000000 [repend/only x:[] [i random now random "abcd"]] view layout [ across li: list 310x400 [ across text 55 blue text 170 text 80 brown ] supply [ face/text: either e: pick x count: count + sp [e/:index][none] ] sl: slider 20x400 [sp: value * length? x show li] ]