I've been out of the game for almost a decade and just began horse shopping.   Curious what everyone is feeding their performance horses these days?

The choices are many and opinions strong! 

I'm feeding beet pulp shreds, Unbeetable Complete, Renew Gold and alfalfa hay. Fat and fiber, low to no sugar food. My baby is growing big and strong, elders and broodmare look great, competition horse is always full of energy without being any hotter than a horse named Demon is going to be (the Demon part is from her younger days, she's not as much of a Demon anymore). 

Chewy is my new best friend. Feed is delivered to my garage door. That's probably new in the past decade. 

Hay, Renew Gold when in work, and mineral. As the young ones get in heavier work we will reassess, but yhr 4 y/o is hotter so will probably stick with higher fat/protein feeds vs high sugar/starch feeds.