Using --disable-highres-timer did more harm than good on my system.
Yes, the browser loaded a bit more quickly, but Instagrm looked a total mess, like the CSS files weren't loaded, and several other sites also produced a mess before rendering properly.
I removed the switch pretty quickly!
Things don't take very long to load on my system anyway, I think Thorium is noticeably faster than Supermium in that respect.