# What strategies can be implemented to optimize the loading speed of Bubble.io ap

- Tool: Bubble
- Difficulty: Beginner
- Time required: 20-25 min
- Compatibility: All Bubble plans
- Last updated: March 2026

## TL;DR

Bubble apps can suffer from slow load times due to plugin bloat, unoptimized images, excessive database queries, and complex page structures. This tutorial provides actionable strategies for reducing page load time including auditing plugins, compressing images, minimizing element counts, optimizing Repeating Group performance, leveraging Option Sets, and measuring improvements with real tools.

## Overview: Optimizing Loading Speed in Bubble Apps

This tutorial covers comprehensive performance optimization strategies for Bubble apps. You will identify the most common causes of slow loading, apply specific fixes for each, and measure the results using browser tools and Google PageSpeed Insights.

## Before you start

- A Bubble app experiencing slow load times or wanting to optimize proactively
- Access to Google PageSpeed Insights (pagespeed.web.dev)
- Basic understanding of Bubble pages, elements, and plugins

## Step-by-step guide

### 1. Audit and remove unused plugins

Go to the Plugins tab and review every installed plugin. Plugins load their JavaScript and CSS on every single page of your app, regardless of whether that page uses the plugin. Delete any plugin you are not actively using. For plugins you use on only one page, check if the same functionality can be achieved with an HTML element or API Connector call instead. Reducing from 15 plugins to 5 can cut page load time significantly. After removing plugins, test your app thoroughly to ensure nothing breaks.

> Pro tip: Every plugin removed can save 50-200KB of JavaScript loaded on every page. This is the single highest-impact optimization you can make.

**Expected result:** Your app loads noticeably faster after removing unused plugins.

### 2. Optimize images before uploading

Compress all images before uploading to Bubble using tools like TinyPNG, Squoosh, or ImageOptim. Aim for under 200KB per image and use JPEG for photos, PNG for graphics with transparency, and WebP for best compression. Bubble added image auto-compression in February 2026 (~60% faster loads), but starting with optimized source files is still better. For images in Repeating Groups, use smaller thumbnail versions rather than full-size images. Set explicit width and height on Image elements to prevent layout shifts during loading.

**Expected result:** Images load faster throughout your app without visible quality loss.

### 3. Reduce element count per page

Bubble renders every element when the page loads, even hidden ones. Open the Element Tree and count your elements — pages with more than 100-150 elements start to slow down. Reduce count by: combining nested groups that serve no structural purpose, using Repeating Groups instead of duplicating similar element groups, converting multi-section pages into tabbed interfaces where only one section loads at a time, and moving complex sections into reusable elements. Hidden elements still consume rendering resources — use conditionally loaded groups instead.

**Expected result:** Pages with fewer elements render faster, especially on mobile devices.

### 4. Optimize Repeating Group performance

Repeating Groups are the most common performance bottleneck. Optimize by: (1) Paginating to 10-20 items maximum per page. (2) Using database constraints instead of client-side :filtered operator — constraints run server-side and are much faster. (3) Never putting Do a Search for inside Repeating Group cells — each cell triggers a separate query, multiplying by the number of visible cells. (4) Pre-computing values as fields instead of calculating in the cell (e.g., store comment_count on Post rather than counting comments per cell). (5) Using parent group data references to avoid redundant searches.

> Pro tip: Replace ':filtered' (client-side, slow) with search constraints (server-side, fast) whenever possible. This single change often improves Repeating Group speed by 5-10x.

**Expected result:** Repeating Groups load and filter data significantly faster.

### 5. Replace database searches with Option Sets for static data

Option Sets load from cached client-side code with zero workload unit cost and zero server round-trip time. Identify any Data Types that contain static, developer-managed data — statuses, categories, roles, countries — and convert them to Option Sets. Update all references from Do a Search for [Type] to the Option Set values. For dropdowns that previously used a Data Type as their data source, switch to the corresponding Option Set. This eliminates database queries for data that never changes per user.

**Expected result:** Static data loads instantly from cache instead of requiring database queries.

### 6. Measure improvements with PageSpeed Insights

Before and after each optimization, test your app with Google PageSpeed Insights (pagespeed.web.dev). Enter your app's live URL and review both mobile and desktop scores. Pay attention to Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS). Also use your browser's DevTools Network tab to measure actual page load time and resource sizes. Document your scores before and after each change to quantify the impact.

**Expected result:** You have measurable before-and-after performance data showing the impact of each optimization.

## Complete code example

File: `Workflow summary`

```text
LOADING SPEED OPTIMIZATION CHECKLIST
======================================

1. PLUGIN AUDIT (highest impact):
   □ List all installed plugins
   □ Delete unused plugins
   □ Replace single-page plugins with HTML/API alternatives
   □ Target: under 5-7 essential plugins

2. IMAGE OPTIMIZATION:
   □ Compress all images (under 200KB each)
   □ Use JPEG for photos, PNG for transparency, WebP for best compression
   □ Use thumbnails in Repeating Groups
   □ Set explicit width/height on Image elements

3. ELEMENT COUNT REDUCTION:
   □ Audit Element Tree per page (target: under 100-150)
   □ Merge unnecessary nested groups
   □ Use Repeating Groups instead of duplicated elements
   □ Convert sections to tabs (load one at a time)
   □ Move complex sections to reusable elements

4. REPEATING GROUP OPTIMIZATION:
   □ Paginate to 10-20 items per page
   □ Use constraints instead of :filtered
   □ Never use Do a Search for inside cells
   □ Pre-compute values as fields
   □ Use parent group data references

5. OPTION SET MIGRATION:
   □ Identify static Data Types
   □ Convert to Option Sets
   □ Update all references (dropdowns, conditions, workflows)

6. MEASUREMENT:
   □ Baseline: PageSpeed Insights score before changes
   □ After each change: re-test and document improvement
   □ Target: 50+ mobile score, under 3s LCP
```

## Common mistakes

- **Optimizing before measuring the baseline** — Without a baseline measurement, you cannot quantify the impact of your changes or know which optimizations had the most effect Fix: Run PageSpeed Insights and browser DevTools Network analysis before making any changes, and document the results
- **Using :filtered instead of search constraints on Repeating Groups** — The :filtered operator downloads all matching records to the browser and then filters client-side, while constraints filter server-side and only send matching records Fix: Convert :filtered operations to Do a Search for constraints wherever the filter can be expressed as a database constraint
- **Keeping plugins installed just in case they might be needed later** — Every unused plugin adds JavaScript and CSS to every page load, slowing down the entire app for a feature nobody is using Fix: Delete unused plugins immediately. They can always be reinstalled later if actually needed.

## Best practices

- Remove unused plugins — this is the single highest-impact optimization
- Compress images before uploading and use thumbnails in lists
- Keep page element count under 100-150 for fast rendering
- Use search constraints instead of :filtered for Repeating Groups
- Pre-compute values like counts and averages as database fields
- Convert static Data Types to Option Sets for zero-cost loading
- Paginate Repeating Groups to 10-20 items per page
- Measure performance before and after each optimization with PageSpeed Insights

## Frequently asked questions

### What is a good PageSpeed Insights score for a Bubble app?

Most Bubble apps score 30-50 on mobile due to framework overhead. A score above 50 is good, and above 70 is excellent for a Bubble app. Focus on improving LCP and reducing JavaScript payload.

### Why do plugins slow down every page even if they are only used on one?

Bubble loads all plugin JavaScript and CSS on every page regardless of usage. There is no per-page plugin loading. This means 15 plugins add their combined code to every single page load.

### How many elements per page is too many?

Performance starts degrading around 100-150 elements. Complex pages with 300+ elements can become noticeably slow, especially on mobile devices with less processing power.

### Does Bubble have built-in caching?

Bubble caches Option Sets on the client and provides automatic database search caching for unchanged data. For API responses, you need to implement your own caching by storing results in the database.

### Can RapidDev help optimize my Bubble app's performance?

Yes. RapidDev can perform a comprehensive performance audit, identify bottlenecks, implement optimizations, and measure improvements for your Bubble app, often achieving 2-3x faster load times.

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Source: https://www.rapidevelopers.com/bubble-tutorial/strategies-optimize-loading-speed-bubble-apps
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