Why is my low-code app slow after adding more records?

Low-code apps often get slower as record counts grow because the app platform may be doing more work behind the scenes than it looks like. Common reasons include:

1. Too much data is being loaded at once

If screens, galleries, or tables pull thousands of records instead of only what’s needed, performance drops fast.

Examples

• Loading an entire table on app start
• Showing a gallery without filtering or paging
• Using “collect all records” patterns

2. Non-delegable queries

Some filters, sorts, and formulas can’t be executed by the data source, so the app pulls data locally and processes it itself. That becomes slow as records increase.

Typical signs

• Warnings about delegation
• Filters using unsupported functions
• Searching large lists with expressions the connector can’t delegate

3. Inefficient formulas

Repeated calculations, nested LookUp/Filter, or formulas that run for every row can slow down screens.

Examples

• Calculating the same value multiple times
• Using complex AddColumns, ForAll, or nested lookups on large datasets
• Re-evaluating formulas unnecessarily

4. Too many network calls

Each query to the backend adds latency. If a screen triggers lots of separate calls, it can feel sluggish.

Examples

• Many lookups for related data
• Loading images/files individually
• Refreshing data too often

5. Large images, attachments, or media

Records may include files or images that take time to download, especially on slow networks.

6. Connector or backend limits

The bottleneck may not be the app itself. The database, API, or connector might be slow or rate-limited.

7. UI rendering overhead

Even if data loads quickly, rendering hundreds of rows, complex templates, or lots of controls per item can make screens slow.

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How to improve it

• Filter data at the source
• Avoid loading all records into local collections
• Make queries delegable where possible
• Use paging or infinite scroll
• Reduce per-row formulas and nested lookups
• Minimize images/attachments on initial load
• Cache only what’s needed
• Simplify gallery/item templates
• Check app performance tools or monitor logs

If you want, I can help you diagnose it based on your platform, like Power Apps, AppSheet, OutSystems, Mendix, or another low-code tool.