CompressX Documentation

Everything you need to install, configure, and get the best performance from CompressX Free and Pro.

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Best Practices for Large Media Libraries

Jan 25, 2026 | Docs

This guide explains how to reliably complete image optimization for large WordPress media libraries (e.g. 10GB+ storage, dozens of thumbnails per image) using CompressX.

1. Managing Images and Thumbnails

CompressX (Free and Pro) converts JPG and PNG images into WebP or AVIF formats.

  • 1. Original full-size images are retained (Default).
  • 2. Original JPG/PNG thumbnails can be automatically deleted after conversion (Pro only) (Optional). This is the most effective way to reduce storage usage

2. Recommended Optimization Workflow

For large media libraries, it is recommended to prepare before starting optimization.

Backup Before Optimization

Since the library size is large, perform a full website backup before starting.
WPvivid (It’s free) can be used for this purpose.

Adjust Processing Speed

Control how fast images are processed to balance optimization performance and server resource usage.
Lower processing speed helps reduce CPU and memory consumption, especially on shared or limited hosting environments.

Recommended settings:
Go to: CompressX → General Settings → Queue Throughput

  • High-performance servers
    Select 10 or 20 images per batch to speed up processing.
  • Standard servers
    Select 1 or 5 images per batch to prevent timeouts.

3. Run Optimization in the Background (Pro only) (Optional)

The optimization process can be run in the background, so the browser tab does not need to remain open.
Detailed instructions are available here: Bulk Optimization