HAR Performance Analyzer

Upload a HTTP Archive (.har) file to review asset waterfalls, network payload sizes, and page load grades.

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.HAR

HAR Analyzer

app-performance.har Completed

Generated on May 15, 2024, 10:30 AM • 1.24 MB • 632 Requests • 12.47 s

Overview

High level summary of your HAR file performance

Filters:

Performance Score

78 /100

Good Overall performance is good

Total Requests

632100%

Total HTTP assets captured

Total Size

1.24 MB100%

Sum of transfer sizes

Total Time

12.47 s100%

Complete load timeline

Potentially Unused

39 6.17%

Heuristic estimate of JS/CSS

Potential Savings

512.45 KB 41.14%

Reduction Possible

Top Recommendations

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Requests Breakdown

Performance Grades

Show Unused Only

Clear Filters

	#	Name	Method	Status	Type	Domain	Size	Time	TTFB	Waterfall	Cache-Control

Showing 1 to 10 of 632 requests

Rows per page:

Performance Analysis

Deep in-depth analysis of every request — what's slow, why, and exactly what to fix

0 /100

Performance Score

Request Timeline

Network Phase Breakdown

Timings Summary

Detailed timing breakdown and analysis

Page Load Timing Breakdown

Time Distribution

Phase	Time	Percentage

Timing Metrics

Show Unused Only

#	Name	Status	Type	Size	Redirect	DNS Lookup	Connect	SSL/TLS	TTFB	Content Download	Total Time ↓	Waterfall

Showing 1 to 10

Rows per page:

Timing Insights

Key insights from your page timing analysis

Domains Summary

Breakdown of requests by domain and third-party analysis

Requests by Domain

Transfer Size by Domain

Time Distribution by Domain

Domain	Type	Requests	Transfer Size	Total Time	Avg TTFB	Impact

Domain Insights

Resources Summary

Detailed analysis of all loaded resources

Resources by Type

Resources by Size

Resources by Time

#	Name	Type	Status	Size	Time	Cached	Waterfall

Opportunities

Cache Summary

Cache efficiency and browser caching analysis

Cache Status Distribution

Cache Savings

Cache-Control Summary

URL	Type	Status	Cache Status	Size	Time	Cache-Control

Cache Insights

Cookies Summary

Cookie usage, security, and third-party analysis

Cookies by Domain

First vs Third-Party

SameSite Attribute

Cookie Name	Domain	Type	Size	SameSite	Secure	HttpOnly

Cookie Insights

Headers Summary

HTTP request and response headers analysis

Response Header Size

Top Response Headers

Security Headers Overview

#	Header Name	Type	Occurrences	%	Avg Size	Example Value

Header Insights

Content Summary

Content type analysis and compression overview

Content Type Distribution

Content Encoding

Transfer Details

URL	Content Type	Status	Size	Encoding	Time	Cached

Content Insights

Security Summary

HTTPS usage, mixed content, and security headers analysis

Issues by Severity

Issues by Category

Security Protocols

#	URL	Issue	Severity	Category	Status

Security Insights

Redirects Summary

HTTP redirect chains and impact analysis

Redirect Types

Redirects by Status Code

Top Redirecting Domains

#	URL	Domain	Status	Time	Type

Redirect Insights

Errors & Warnings Summary

HTTP errors, client errors, and performance warnings

Errors vs Warnings Over Time

By Type

By Severity

#	Severity	Type	Status	URL	Domain	Time	Impact

Top Affected Domains

Unused Resources Summary

Heuristic analysis of potentially unused JS/CSS — large uncached assets with high TTFB. Use browser DevTools Coverage panel for precise data.

Unused by Type

Unused by Content Type

Unused by Domain

URL	Type	Domain	Size	Potential Savings	Impact	Reason

Unused Insights