That's really up to you. Keep in mind that if you warm up fully for split squats, that will have a great carry over to deadlifts. After I deadlift (on days where I deadlift, it's always my first movement), I normally only do a set or two of my next exercise for weight acclimation before starting my working sets; my muscles and joints are warmed up at that point already. I normally spend 15-20 minutes at the beginning of every training session getting warmed up and loose though, so it's a little different I suppose.

Ask yourself this:
Is my second set better than my first because I'm more warmed up?
Do my joints & muscles feel fully warmed up when I get to my working sets?
Can I do more warm up sets without hurting the quality of my working sets?

I'm sure I'm overlooking some stuff. IMO most people don't warm up enough. I have a 90 year old's body, so I HAVE to do plenty of sets. Experiment with it. I think you'll find a good medium. I have hip, knee, and shoulder issues right now & I end up doing about 4-6 sets of 2-4 reps before I feel like I can handle a working set. Sometimes it's even more than that.

My knee is doing the same thing right now. It's a pain in the ass, isn't it?

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