Off the back
My strategy is to "share the workload" as much as possible. At least try to stay off the largest two cogs when in the big ring. The resultant cross-chaining will grind down the best of rings. Fresh chains go on every 4k.Yeah - not in the small ring much at all. The cassette is relatively new. I ordered a new chainring and chain. While everything's apart, I'll inspect the derailleur jockey/idler pulleys. That should eliminate any (real or perceived) drag.
Those Dura Ace 7900 or 9000 big rings cost an arm and a leg. Luckily, my stash includes new ones in reserve, after scoring them for cheap. The rings on both my groups got over 15k miles and look good for at least another 10k.
Never hurts to see how freely the cranks spin with the chain off. Sometimes some grit works its way in there early and causes a premature death. Fortunately, the DA or Ultegra bb's are inexpensive.