If performance is critical then don't use AngularJS. It brings overhead related to watching the data sources (config which includes resources, events).
The jQuery plugin is an alternative way of initialization and doesn't bring any performance penalty.
You can also use the plain JavaScript syntax:
<div id="dp"></div>
<script>
var dp = new DayPilot.Scheduler("dp");
dp.startDate = "2015-01-01";
// ...
dp.init();
</script>