Spark Speed · Caching & optimization
One click to peak performance.
The caching and optimization plugin that checks every change on your pages before applying it. Fully reversible and completely on your own server, no cloud.
100% PHP, no cloud
Runs on shared hosting
1-click reversible
Cache
~10ms response
Verified
Every change
Instant
Pre-rendered
Secure
Never breaks
Rollback
1-click rollback
No cloud
100% PHP
Spark Speed proves it per page, instead of letting you hope everything works out. The approach is always the same:
measure, apply, and then verify everything still works. Page by page.
What makes Spark Speed unique
Four things that together show how Spark Speed tackles optimization.
Self-checking
Every risky optimization is tested on a live shadow-render of your own page before it stays. If something breaks, it's automatically not applied.
AI does the fine-tuning
Know exactly which scripts can wait and which CSS can go without breaking the site. Claude generates a precise, safe configuration, tailored specifically for your site.
Always fails safely
An error or offline component never breaks your page. At worst, a page is correct but slightly less optimized, never broken.
Privacy-first, no cloud
Everything happens on your own server. No external services seeing your HTML or images. No Node, no Chromium.
Core feature 1
1-click optimization with visual regression testing
One button. Spark Speed measures your site, applies safe optimizations, and then checks every risky optimization on an actual render of your key page types: home, shop, product, page and post.
Functional flows
Menus, sliders, accordions, add-to-cart, forms, facets, popups, cookie banner and analytics keep working.
Layout
No elements that shift or disappear. The page remains exactly as it looked before.
Visual regression
A detailed comparison per element (background, text color, font, border), so that a removed style rule that changes a color is also noticed.
Only what demonstrably breaks nothing remains. The rest is automatically skipped, with a clear reason in the log. And everything can be completely reverted with one click.
Core Feature 2
AI hyper-optimization
The biggest speed gains come from precise tuning per site: which scripts to defer, which to exclude, which unused CSS to remove. Spark Speed lets AI do that work, with a switchable engine.
No API costs
Claude skill (default)
Export your diagnosis, run the skill in your own Claude subscription, import the generated configuration. No extra credits needed.
Your own key
Claude API (optional)
Enter your key, click Generate with AI, and the plugin fetches the configuration automatically. Choose your model, from maximum accuracy to lowest cost.
Whatever the AI suggests still goes through the same 1-click verification afterward. The AI expands optimization, the self-test keeps it safe. You get AI sharpness without the risk.
What Spark Speed delivers for you
Tested per page, fully reversible, and everything runs on your own server.
FeatureSpark SpeedWhy it matters
Every optimization verifiedTested per pageNo blind assumptions, every change checked
Visual regression testingColor, font and layoutYou see immediately what changes
AI fine-tuningCustomized per sitePrecise configuration without manual work
Auto-rollbackPer individual URLNever all-or-nothing disable
Instant navigationPre-renderedThe next page feels instant
Without the cloudEverything on your serverNo external service needed
Self-host Google FontsGDPR-compliantWorks even when Google is slow
Object cacheRedis, Memcached, SQLiteFaster admin, cart and checkout
Fails gracefullyBuilt-in kill switchSlower at worst, never down
What you get immediately
Upon activation, without further steps.
Page cache
HTML is served before WordPress, in the order of tens of milliseconds.
Instant navigation
The next page is already pre-rendered on hover, with fallback for Safari and Firefox.
Combine CSS
All own stylesheets merged and inlined, with a guard that skips corrupted CSS.
Self-host Google Fonts
Locally served, GDPR-proof, and loads even when Google is slow.
JS defer and delay
Smart exclusions so page builders keep working.
Lazy-load plus dimensions
Stable layout without shifting (CLS).
LCP-preload and preconnect
The critical image source loads first, font-display on swap.
Bloat-removal
Remove emoji, jQuery Migrate and wp-embed.
Object cache
Redis, Memcached, APCu or SQLite for faster admin, cart and checkout.
Auto-blueprint
Detects your stack and automatically sets the right exclusions and keep-selectors.
Reliability as foundation
Speed should never come at the cost of stability. Four guardrails make sure it doesn't.
Auto-rollback
If an optimized page reports an actual render issue, Spark automatically disables optimization for that single URL.
Conflict-detection
Never unilaterally takes over another plugin's cache.
Fail-open
A problem means at worst slower performance, never broken.
Safe mode
A kill switch that only caches and optimizes nothing else.
One plugin, every site
Annually or monthly, per number of sites up to unlimited. You can cancel anytime.
Ready for Monday morning
Enable speed without the worry.
Spark Speed proves page by page that it's safe, instead of leaving you to figure it out. Your shop won't break on Monday morning.