Debugging Slow Gallery Rendering in Power Apps

When a gallery screen starts feeling slow, I try not to optimize blindly. The first step is to decide whether the delay comes from data retrieval, formula recalculation, or control rendering.

What I Check First

1. Whether OnVisible is doing too much work at once.
2. Whether repeated LookUp, Filter, or AddColumns calls are being recalculated inside item templates.
3. Whether a connector or data source is returning more columns or rows than the screen needs.

A Useful Pattern

Instead of letting the gallery build everything dynamically, I prefer to shape data earlier and bind the gallery to something simpler.

ClearCollect(
    colOpenRequests,
    ShowColumns(
        Filter(
            ServiceRequests,
            Status = "Open" && AssignedTo.Email = User().Email
        ),
        ID,
        Title,
        Priority,
        Modified
    )
);

This helps in three ways:

• the gallery receives a narrower dataset
• repeated formulas inside the template become simpler
• debugging becomes easier because the data shape is explicit

Questions I Leave for My Future Self

• Can this filter be delegated fully?
• Does the user need fresh data every visit, or can I cache temporarily?
• Can I move expensive formulas out of labels and into a prepared collection?

Outcome

This kind of cleanup usually does not require a major redesign. In many cases, the improvement comes from removing repeated work and making the screen state more predictable.

That makes the app faster and the next debugging session easier.