Request Details

Route
/slow GET
Timestamp
Sep 23, 2026 6:03 PM
Duration
546.18 ms
Status
200
Response Size
58 KB
Error
No

Performance Breakdown

Database
2.6% (6 queries)
View Rendering
3.9%
Application Logic
93.5%
Other Operations
0.0%
Total Operations
16
Slowest Operation
546.18 ms

Request Trace

How to read this

Each row is a layer of your stack. Many short Database bars means N+1 queries — fix with includes(). A wide Action bar with little Database time means slow Ruby code. A wide View bar usually means a partial rendered in a loop.

Action
View
Database
Other
Action
View
Database
0.0ms 730.2ms 1460.4ms 2190.7ms 2920.9ms

Operations

How to use this

Sort by Impact to find your biggest wins. Click any row for details and optimisation suggestions. The same SQL appearing multiple times is an N+1 — fix with includes(). A single operation above 50% impact is your highest priority.

Operation Duration Impact Timeline Actions
SELECT * FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id LEFT JOIN tags ON posts.id = tags.post_id LEFT JOIN categories ON posts.category_id = categories.id WHERE users.active = ? AND posts.publi... 6 ms 1.1%
layouts/application 18 ms 3.3%
SELECT * FROM (SELECT users.id, users.name, users.email, COUNT(posts.id) as post_count FROM users LEFT JOIN posts ON users.id = posts.user_id WHERE users.active = ? GROUP BY users.id) as user_posts JOIN (SELECT user_id, COUNT(*) as comment_count FROM c... 2 ms 0.4%
SELECT * FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id LEFT JOIN tags ON posts.id = tags.post_id LEFT JOIN categories ON posts.category_id = categories.id WHERE users.active = ? AND posts.publi... 15 ms 2.7%
INSERT INTO posts (user_id, title, content, published, created_at, updated_at) VALUES (?, ?, ?, ?, ?, ?) 27 ms 4.9%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 1 ms 0.2%
home#slow 546 ms 100.0%
home#slow 546 ms 100.0%
users/index 29 ms 5.3%
layouts/application 28 ms 5.1%
layouts/application 31 ms 5.7%
home#slow 546 ms 100.0%
home#slow 546 ms 100.0%
home#slow 546 ms 100.0%
SELECT name FROM users 24 ms 4.4%
home/index 9 ms 1.6%