Luna Vista, a muni in Dallas, changed a par 4 into a 3 and a par 3 into a 4.
Hole #3 used to be a par 4 dogleg right with certain trouble at the dogleg. Lots of high grass, shrubs and scattered trees. Put your ball in there and it was lost. So, they shortened it up and now you hit up to a plateaued green about 160 yards long and 50 yards left of the old dogleg.
Hole 4 used to be a straight-away par 3 with a pond right-front of the green. Uphill approach into the green with a bunker between the pond and green. They just moved the tees back closer the the #3 green so now it's a par 4.
Since there is no reason to hit into the trouble and try to carry the dogleg, it probably speeds up play.