Request Details

Route
/slow GET
Timestamp
Sep 17, 2026 2:13 PM
Duration
260.89 ms
Status
204
Response Size
50 KB
Error
No

Performance Breakdown

Database
7.6% (6 queries)
View Rendering
14.4%
Application Logic
78.1%
Other Operations
0.0%
Total Operations
15
Slowest Operation
260.89 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 250.7ms 501.3ms 752.0ms 1002.7ms

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
home/index 19 ms 7.3%
SELECT * FROM users WHERE id = ? 11 ms 4.2%
layouts/application 39 ms 14.9%
users/index 9 ms 3.4%
home#slow 261 ms 100.0%
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... 16 ms 6.1%
home#slow 261 ms 100.0%
home/index 15 ms 5.7%
SELECT DISTINCT users.*, posts.*, comments.* FROM users, posts, comments WHERE users.id = posts.user_id AND posts.id = comments.post_id AND users.created_at > ? AND posts.created_at > ? AND comments.created_at > ? 9 ms 3.4%
users/index 30 ms 11.5%
home#slow 261 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 14 ms 5.4%
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... 4 ms 1.5%
layouts/application 32 ms 12.3%
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... 22 ms 8.4%