Request Details

Route
/error_prone GET
Timestamp
Sep 09, 2026 5:18 PM
Duration
57.56 ms
Status
204
Response Size
6.1 KB
Error
No

Performance Breakdown

Database
19.0% (5 queries)
View Rendering
19.0%
Application Logic
62.1%
Other Operations
0.0%
Total Operations
15
Slowest Operation
57.56 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 115.9ms 231.9ms 347.8ms 463.8ms

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
layouts/application 19 ms 33.0%
posts/show 28 ms 48.6%
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... 4 ms 6.9%
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... 33 ms 57.3%
users/index 8 ms 13.9%
layouts/application 7 ms 12.2%
layouts/application 26 ms 45.2%
home#errors 58 ms 100.0%
home#errors 58 ms 100.0%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 34 ms 59.1%
SELECT * FROM posts WHERE created_at > ? 12 ms 20.8%
home#errors 58 ms 100.0%
home#errors 58 ms 100.0%
home#errors 58 ms 100.0%
SELECT users.* FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id WHERE users.active = ? AND posts.published = ? AND comments.approved = ? OR users.created_at > ? AND posts.created_at > ? AND commen... 5 ms 8.7%