Going to put in some eye screws under the deck for a swing.
Should I add some glue in the predrill for extra durability?
I've also read vaseline is good for easier installation, but that's opposite of what I'm asking...
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Are you using an eye bolt or an eye screw?
For an eye screw, glue won't do much and is not needed. (Although some glues may act as a lubricant when you first screw-in the eye-screw.) Use bar soap or beeswax as a lubricant.
For an eye bolt, especially if you want it to be able to pivot, use appropriate washers, plus two nuts with a lock-washer in between. For extra reliability use Loctite, not glue, where the nuts and eye-bolt meet.
If you don't need/want pivoting action, then one nut may suffice, but Loctite is even more important because such eye-bolts always loosen their compressive grip on the wood over time.