Skip to main content

Web Performance Basics: From First Screen To Cache Strategy

Website performance is not an add-on to "optimize later." When building a site for the first time, many of your default choices directly determine how fast it will be.

What Mainly Affects Performance During Site Building​

The most common factors are:

  • HTML, CSS, and JavaScript file sizes
  • Image and font sizes
  • Number of requests
  • Whether caching is working
  • Whether you are using a CDN
  • Origin response speed
  • Whether too much logic is loaded on the first screen

Start With the Most Important Things​

1. Keep Resources Small​

The most common slowness on a first site is not an advanced performance issue. It is:

  • Images that are too large
  • First-screen scripts that are too heavy
  • Loading too many third-party resources at once

2. Design Caching in Layers​

At minimum, separate:

  • HTML
  • Hashed static assets
  • Images and downloadable files
  • APIs

3. Route Static Assets Through a CDN Where Possible​

This makes repeat visits and cross-region access more stable.

Performance Actions Worth Prioritizing​

Compression and Format Optimization​

  • Convert images to web-appropriate sizes and formats
  • Enable compression for text resources
  • Remove obviously unnecessary third-party scripts

Resource Splitting and Lazy Loading​

  • Only load what the first screen actually needs
  • Images on long pages can load on demand
  • Do not let a simple content page carry an overweight script bundle

Correct Caching​

  • Static assets with version numbers should use long cache durations
  • HTML pages should be cached more cautiously
  • Frequently changing data should not be incorrectly long-cached

Why Performance Optimization Relates to Architecture Choices​

Because:

  • Static sites are naturally easier to cache
  • CDNs handle reusable content better
  • The more the edge layer can hit, the less pressure on the origin
  • The clearer the resource organization, the easier it is to optimize

Most Common Performance Pitfalls on a First Site​

1. Uploading Original Images Directly to the Homepage​

This is the most typical and the easiest problem to fix.

2. Adding Too Many Third-party Components to the Homepage​

Maps, analytics, comments, fonts, and animation scripts together can easily slow down a simple page.

3. No Caching Strategy​

Either nothing is cached, or everything is long-cached. Both lead to problems.

4. Only Watching the Lighthouse Score Without Understanding the Real Bottleneck​

The score is a reference, not the goal. You should first confirm:

  • Is the first screen noticeably slow?
  • Are images too large?
  • Are there too many requests?
  • Is caching simply not working?

A Practical Optimization Sequence​

  1. Reduce resource size first
  2. Then reduce unnecessary requests
  3. Then get caching and CDN right
  4. Only then look at finer rendering and script optimization