Speed optimization (LCP, FID, CLS)

Online Casino Speed Optimization (LCP, FID, CLS)

In the industry, online speed is everything. Slow downloads - loss of players, money and search positions. Google actively uses Core Web Vitals (LCP, FID, CLS) in the ranking, and users in the decision to stay or leave. Optimizing these metrics is a prerequisite for a successful platform.

Core Web Vitals Key Metrics

Metric	Decryption	What measures
LCP (Largest Contentful Paint)	Time to display main content	Main indicator of visual speed
FID (First Input Delay)	First Interaction Delay	Script Effects on Responsiveness
CLS (Cumulative Layout Shift)	Visual Interface Jumps	Loading Layout Stability

Purpose:

• LCP — < 2. 5 sec
• FID <100 ms
• CLS — < 0. 1

Why it's critical for casinos

Instant load = fewer failures
Fast interface response = higher conversion on deposit
Improving positions at Google and reducing the cost of SEO promotion
Better performance on weak devices and mobile networks

Optimization methods

LCP

Preload images and fonts
Use of modern formats (WebP, AVIF)
Lazy Load for secondary content only
FID

Minimization of JavaScript, breakdown by chunk
Delayed and asynchronous script loading
Using 'requestIdleCallback'
CLS

Set fixed sizes for blocks and media
Excluding dynamic inserts without spare space
Optimizing advertising slots and pop-ups

Monitoring and analysis tools

Google PageSpeed Insights
Lighthouse + DevTools
Web Vitals JS
Search Console → Core Web Vitals
Real User Monitoring (RUM)

Optimization results

CR (conversion rate) increase by 10-30%
20-40% reduction in failure rate
Increasing time on the site
Increase page indexing and search visibility

Optimization of LCP, FID and CLS - not only about "technical glasses" from Google, but also about real money. In online casinos, where every second affects the player's decision, high speed is a competitive advantage. Fast, responsive, stable casino = more players and higher revenue.