Request Details

Route
/slow GET
Timestamp
Sep 12, 2026 5:46 AM
Duration
278.68 ms
Status
201
Response Size
160 KB
Error
No

Performance Breakdown

Database
2.8% (6 queries)
View Rendering
3.3%
Application Logic
94.0%
Other Operations
0.0%
Total Operations
25
Slowest Operation
278.68 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 889.8ms 1779.6ms 2669.4ms 3559.2ms

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... 35 ms 12.6%
users/index 19 ms 6.8%
users/index 7 ms 2.5%
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... 15 ms 5.4%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
SELECT posts.title, posts.content, users.name FROM posts JOIN users ON posts.user_id = users.id WHERE posts.published = ? 4 ms 1.4%
home#slow 279 ms 100.0%
SELECT * FROM posts WHERE title LIKE ? AND content LIKE ? AND LOWER(title) LIKE ? AND UPPER(content) LIKE ? 16 ms 5.7%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
users/index 8 ms 2.9%
SELECT * FROM users WHERE id = ? 17 ms 6.1%
users/index 35 ms 12.6%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
posts/show 10 ms 3.6%
layouts/application 14 ms 5.0%
users/index 23 ms 8.3%
home#slow 279 ms 100.0%
home#slow 279 ms 100.0%
SELECT id, name, email FROM users WHERE id = ? 12 ms 4.3%