Spring Security auto-configuration in Spring Boot - Performance & Optimization

Performance: Spring Security auto-configuration

MEDIUM IMPACT

This affects the initial page load speed and backend response time by adding security filters and processing overhead.

Securing a Spring Boot web application with default settings

Spring Boot

Customize security configuration to exclude static resources and disable CSRF where not needed, reducing filter chain length.

Reduces the number of filters executed per request and avoids security checks on non-sensitive endpoints.

📈 Performance GainSaves 30-70ms per request, improving LCP by reducing backend processing delay.

Securing a Spring Boot web application with default settings

Spring Boot

spring-boot-starter-security dependency added with no customization, enabling all default filters and CSRF protection on all endpoints.

Default auto-configuration applies many security filters globally, causing unnecessary processing on static resources and simple endpoints.

📉 Performance CostAdds multiple filter executions per request, increasing backend response time by 50-100ms on average.

Performance Comparison

Pattern	DOM Operations	Reflows	Paint Cost	Verdict
Default auto-configuration with all filters	N/A (server-side)	N/A	Increases backend response delay	[X] Bad
Customized security config excluding static resources	N/A (server-side)	N/A	Reduces backend response delay	[OK] Good

Rendering Pipeline

Spring Security auto-configuration adds servlet filters that run before the controller logic, increasing server processing time before HTML is sent to the browser.

→Server Request Processing

→Response Generation

⚠️ BottleneckFilter chain execution time before response is generated

Core Web Vital Affected

LCP

This affects the initial page load speed and backend response time by adding security filters and processing overhead.

Optimization Tips

1Avoid applying security filters to static resources to reduce backend processing time.

2Disable unnecessary security features like CSRF on non-sensitive endpoints to improve response speed.

3Monitor backend response times in DevTools Network tab to detect security-related delays.

Performance Quiz - 3 Questions

How does Spring Security auto-configuration typically affect page load performance?

A It reduces CSS and JavaScript bundle sizes.

B It improves browser rendering speed by optimizing DOM updates.

C It adds server-side processing time due to filter chains before response is sent.

D It eliminates the need for client-side caching.

DevTools: Network

How to check: Open DevTools, go to Network tab, reload the page, and check the Time column for backend response time.

What to look for: Look for long server response times indicating backend processing delays caused by security filters.