Mida - Lightweight A/B testing that respects your site speed

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Most A/B testing tools make you choose between experimentation and performance.

Mida is built to remove that trade-off.

At its core, Mida uses a small, modern JavaScript loader designed to keep your site fast, responsive, and stable — while still giving you the flexibility to run meaningful experiments.

No bloated libraries. No “one-size-fits-all” bundles. Just what you need, when you need it.

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Why Is Mida So Fast?

Built with modern JavaScript without legacy baggage

Many experimentation tools still rely on older patterns and heavy dependencies like jQuery. Mida doesn’t.

By using Vanilla JavaScript and modern browser APIs, Mida avoids unnecessary weight and executes changes more efficiently helping reduce impact on metrics like Largest Contentful Paint (LCP) and overall page load time.

A small core, not an oversized bundle

Instead of shipping every feature to every visitor, Mida is designed around a lean core loader that handles the essentials:

• visitor identification
• experiment assignment
• targeting checks
• applying variations

Additional functionality — like preview tools, integrations, goal tracking, or the live editor — is loaded only when it’s actually needed.

That means:

• everyday visitors get a lighter experience
• advanced features don’t slow down your entire site
• performance stays predictable as you scale experimentation

Performance without the usual side effects

Reduced flicker and better visual stability

Heavy experimentation scripts are a common cause of page flicker and layout shifts — which hurt trust, skew results, and frustrate users.

Mida is designed to minimise visual disruption by being lightweight and careful about when and how changes are applied.

While no tool can guarantee zero flicker in every scenario, Mida helps teams run experiments more smoothly — especially compared to heavyweight, always-on testing scripts.

Predictable performance as you grow

With many tools, adding more tests quietly adds more script weight over time.

Mida takes a different approach:

• the core loader stays small and consistent
• experiment data and changes are fetched dynamically
• optional capabilities are activated only when used

The result is a setup that scales without gradually slowing your site down.

Why website speed still matters

A fast website isn’t just a technical metric — it directly affects outcomes:

• Search visibility: speed is a ranking signal
• User experience: slow pages increase bounce rates
• Trust: sluggish sites feel unreliable
• Sustainability: lighter pages use less data and energy
• Conversions: faster sites convert better

Experimentation should support growth — not undermine it.

Measure what matters (on your site)

Because every website and experiment is different, the most reliable way to assess impact is simple:

Compare performance with and without experiments enabled using tools like:

• Lighthouse
• GTmetrix
• WebPageTest

Look at:

• LCP and CLS
• long tasks
• script loading in the waterfall

Mida is designed to make those comparisons boring — in a good way.

Why teams choose Mida

Teams choose Mida when they want to:

• run experiments without shipping heavy scripts to every user
• protect Core Web Vitals while testing
• avoid legacy dependencies like jQuery
• give marketers and developers a tool they both trust
• scale experimentation without creeping performance costs

Experiment without slowing down

Mida gives you a modern, performance-aware way to test ideas — without paying for features you don’t use or sacrificing site speed along the way.

Start small. Measure impact. Scale with confidence.

👉 Get started for free — up to 25,000 monthly tested users.