[evilduck]

Depends on how busy the intersection is. Worst case scenario:

Miss the first light to cross straight through the intersection. Idle.

Queue into the non-intersection left turn lane to cross two lanes of oncoming traffic. Idle.

Wait for a right turn red light and idle, or wait for an opportunity to merge into two lanes of oncoming traffic and idle.

The best case scenario is light traffic and hitting both lights green, but you're still going further and taking longer to accomplish a left turn signal's best case scenario. A double left turn lane with signal is almost always faster in my experience.