Request Details

Route
/api_complex GET
Timestamp
Sep 13, 2026 11:07 PM
Duration
197.99 ms
Status
400
Response Size
791 Bytes
Error
No

Performance Breakdown

Database
6.3% (6 queries)
View Rendering
8.4%
Application Logic
85.3%
Other Operations
0.0%
Total Operations
17
Slowest Operation
197.99 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 348.2ms 696.5ms 1044.7ms 1392.9ms

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 (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... 6 ms 3.0%
SELECT * FROM users WHERE id = ? 28 ms 14.1%
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... 26 ms 13.1%
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... 6 ms 3.0%
posts/show 19 ms 9.6%
home#api_complex 198 ms 100.0%
SELECT name FROM users 13 ms 6.6%
home#api_complex 198 ms 100.0%
home#api_complex 198 ms 100.0%
layouts/application 8 ms 4.0%
SELECT COUNT(*) FROM comments WHERE post_id = ? 9 ms 4.5%
home#api_complex 198 ms 100.0%
posts/show 24 ms 12.1%
users/index 27 ms 13.6%
users/index 39 ms 19.7%
home#api_complex 198 ms 100.0%
home#api_complex 198 ms 100.0%