If you load multiple collections in the App.OnStart event one after another with ;;, you are wasting time. The Concurrent function evaluates all formulas at the same time in parallel.
power fx
// ❌ Slow (sequential)
ClearCollect(Users, Office365Users.SearchUser());
ClearCollect(Departments, ["IT", "HR", "Sales"]);
// ✅ Fast (parallel)
Concurrent(
ClearCollect(Users, Office365Users.SearchUser()),
ClearCollect(Departments, ["IT", "HR", "Sales"])
);// ❌ Slow (sequential)
ClearCollect(Users, Office365Users.SearchUser());
ClearCollect(Departments, ["IT", "HR", "Sales"]);
// ✅ Fast (parallel)
Concurrent(
ClearCollect(Users, Office365Users.SearchUser()),
ClearCollect(Departments, ["IT", "HR", "Sales"])
);Use it at app startup (OnStart) or on buttons that launch many independent processes.
Mind the separator
Remember that if your Power Apps is configured for the European region, you will need to
change commas , to semicolons ; in formulas. And use double semicolons ;; for chaining
functions where normally a single semicolon ; would be used.
This reduces the app startup time drastically, especially when connecting to multiple data sources.