Why Spring Security matters in Spring Boot - Performance Evidence

Performance: Why Spring Security matters

MEDIUM IMPACT

Spring Security impacts page load speed indirectly by adding backend authentication and authorization checks that can affect response times and user interaction responsiveness.

Securing a web application with authentication and authorization

Spring Boot

http.authorizeRequests().anyRequest().authenticated().and().formLogin().and().sessionManagement().maximumSessions(1);

Form login with session management reduces repeated authentication checks by maintaining user sessions, lowering backend load and improving response times.

📈 Performance Gainreduces backend authentication overhead, improving INP

Securing a web application with authentication and authorization

Spring Boot

http.authorizeRequests().anyRequest().authenticated().and().httpBasic();

Using HTTP Basic authentication sends credentials with every request and lacks session management, causing repeated authentication overhead and slower response times.

📉 Performance Costadds backend processing delay on every request, increasing INP

Performance Comparison

Pattern	Backend Processing	Authentication Overhead	Response Delay	Verdict
HTTP Basic Auth without session	High	High	High	[X] Bad
Form Login with session management	Medium	Low	Low	[OK] Good
Many unordered filters	Very High	Medium	High	[X] Bad
Minimal ordered filters	Low	Low	Low	[OK] Good

Rendering Pipeline

Spring Security operates on the backend before the browser rendering pipeline starts. It affects how fast the server responds with protected content, which influences when the browser can start rendering and responding to user input.

→Server Processing

→Network Transfer

→Browser Rendering Start

⚠️ BottleneckServer Processing due to authentication and authorization checks

Core Web Vital Affected

INP

Spring Security impacts page load speed indirectly by adding backend authentication and authorization checks that can affect response times and user interaction responsiveness.

Optimization Tips

1Use session management to reduce repeated authentication overhead.

2Minimize and order security filters to reduce request processing time.

3Monitor backend response times to protected resources to improve interaction responsiveness.

Performance Quiz - 3 Questions

How does using session management in Spring Security affect performance?

A It blocks browser rendering until the session expires.

B It increases the number of authentication requests per page load.

C It reduces repeated authentication checks, improving response times.

D It adds extra CSS to the page, increasing load time.

DevTools: Network

How to check: Open DevTools, go to Network tab, reload the page, and inspect the timing of requests to secured endpoints.

What to look for: Look for long server response times or repeated authentication requests indicating inefficient security setup.