FlyingPress stores optimized static files to improve performance. Over time, especially on high-traffic or content-heavy sites, these files can accumulate and use significant disk space.
Where Are Files Stored?
All cached and optimized assets are stored in:
/wp-content/cache/flying-press/
This includes subfolders for each cached page, along with minified assets, font files, and metadata.
What Files Are Stored?
Extension | Purpose |
| Cached HTML (gzip), including variants for mobile, user roles, query strings. |
| Optimization metadata (used CSS, fonts, exclusions) |
| Minified styles and scripts |
| Self-hosted Google Fonts CSS |
| Self-hosted Google Fonts files |
| YouTube thumbnails (self-hosted) |
| Gravatar images (self-hosted) |
Estimating Cache Folder Size
Assuming:
One
.html.gzfile ≈ 120 KBOne
.json.gz≈ 80 KBOptional CSS/JS/Fonts/images ≈ variable
Cache size estimates (minimum per page):
Pages | Estimated Size (HTML + metadata) |
1,000 | ~200 MB |
10,000 | ~2 GB |
100,000 | ~20 GB |
1,000,000 | ~200 GB |
Actual usage may be higher depending on how many variants are cached per page and whether font/image self-hosting is enabled.
How to Analyze Disk Usage
Size & count by file type
find ./wp-content/cache/flying-press/ -type f | while read -r file; do ext="${file##*.}"; size=$(du -k "$file" | cut -f1); echo "$size $ext"; done | awk '{s[$2]+=$1; c[$2]++} END {for (e in s) printf "%.2f MB\t%5d files\t%s\n", s[e]/1024, c[e], e}' | sort -hrTop folders by size
du -h ./wp-content/cache/flying-press/ | sort -hr | head -n 20
Largest files
find ./wp-content/cache/flying-press/ -type f -exec du -h {} + | sort -hr | head -n 20
Tips to Reduce Usage
Exclude pages like tags, categories, or search results from caching.
Disable unused features (Google Fonts, YouTube thumbnail, Gravatar self-hosting).
Disable caching for logged-in users unless necessary.
Avoid caching URLs with dynamic query strings unless required.
Clear Cached Files
FlyingPress does not automatically purge cached static files (except for HTML pages and their associated optimizations).
To clear everything manually: Go to FlyingPress → Settings → Purge Everything
This will remove all cached HTML, CSS, JS, fonts, and optimization metadata.