Different jigs "Kick" at different speeds. You have to know your jigs and what the fish want on any given day. Sometimes the fast wind is king, such as when the fish are up and actively chasing bait and aggressive. Other times it is a super slow retrieve that gets bit. It is your job as the angler to watch the fish and conditions and/or identify what others are doing to get their bites. There is not magic bullet. Time and experience. You gotta spedn time at the rail and fish the hell out of them.
It should all depend on the iron
Some swim good at slow speeds and some swim good at faster speeds
Just practice a bit
Generally surface irons work better with a slower speed and yo-yo irons works better with a fast speed
Normally medium speed like 2 turns per second or if there’s a deckhand or cook fishing I match their speed. If no luck I go a little faster. Then do the 3 turn and bleep pause. After that I started singing the 1 little 2.little 3 little Indian song with exaggerated rod pull up to the point of quitting and start fishing bait. Normally, That’s when somebody gets bit on iron and the word dedication goes into my rhythm medium speed.
How do you know what that is? Do you run it near the boat so you can study its behavior, then try to remember your retrieve rate? And then retrieve it at that rate when you can't even see it? Is there a way to feel whether it is swimming properly? I need lots of help in these sorts of details.
Time at the rail. Find a jig that you have confidence in and fish it. Use the same reel all the time. Don't just randomly cast it at the water either, look for some kind of activity and fire the jig past it. If you're fishing a spot with structure go over the structure. Can't tell you how many times you'll see a guy throwing iron in the bow just fishing a complete desert and 10 minutes later saying the fish aren't eating iron. Fish the stern in the chum line, hang back and wait for an opening,might have to stand there awhile and wait for an alley to cast thru.
And don't be little jimmie iron boy whistling a jig by peoples ears,hang back,pay attention to everything around you. If it's shoulder to shoulder put the jig rod in the rack, it's not your moment.
It really does boil down to "the speed that the jig swims the best". If you don't know what a "best swimming jig" looks like, watch an experienced surface iron fisherman. Different jigs have different actions, and each has its' optimum kick at different speeds. Direction and strength of current have a big effect, and certainly your reel's gear ratio plays a part. And then, yes, on certain days the fish seem to have a preference for faster speeds or slower speeds. There's really no substitute for time on the water...
However, it might help when you start out to throw a couple of shorter casts in the direction of the wind/current you intend to fish and watch the cadence of the jig as you bring it back to the boat to get "calibrated" for that particular stop. Adjust your speed accordingly. Then try to mimic that rate on your longer tosses!
depends on your reel as well. you're not going to retrieve the same lure on a tranx, as you would on a slower reel like an old saltiga or an avet. thats why i carry a shimano jig bag filled to the brim. different lures like to be retrieved at different rates, and the fish sometimes want jigs burned fast, and sometimes a little slower. so there is always an excuse when you get skunked.