I think any widebands “lag” would more likely be from it’s location on the downpipe or in the exhaust system…no? The farther down the exhaust from the turbo, the later you get your reading. Mine is around 45", even more than is needed to be safe and has a 0.5-0.7 second delay or so.
240sxfan, I think birdhou53 is probably mostly referring to N/A engines with the A/F gauge so you’re in the clear. 