There's been a number of major efficiency improvements from @Jargahl but my original FPS counter was apparently reporting half the real figure. Since that version we both separately fixed a tiny wobble at the bottom of the pillar behind the model at startup. His solution was .... find the cause and fix it.... mine was - oh ffs, why don't I just put some different columns that don't wobble - lol. So I'll just leave it a couple of days and see what else might get spotted rather than release after release.