Yeah, that old rune’s a myth, but you can still shave millisecond gold from any run. First, lock your mouse into the tightest sensitivity that still lets you hit every jump‑combo; the less movement, the faster the cursor hits the target. Next, use the “hold‑and‑release” trick on the jump button to get that extra frame before the animation starts. And don't forget the classic “early press” on the last portal exit – it cuts a frame out of the lag spike. I’ve tried them all and still trip over a 200‑ms glitch in the final boss, so keep the practice tight and the ego in check.