Request Details

Route
/slow GET
Timestamp
Sep 11, 2026 10:14 AM
Duration
255.18 ms
Status
200
Response Size
190 KB
Error
No

Performance Breakdown

Database
6.5% (9 queries)
View Rendering
3.9%
Application Logic
89.6%
Other Operations
0.0%
Total Operations
25
Slowest Operation
255.18 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 783.5ms 1567.0ms 2350.5ms 3134.0ms

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
users/index 12 ms 4.7%
users/index 36 ms 14.1%
home#slow 255 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... 32 ms 12.5%
home#slow 255 ms 100.0%
home#slow 255 ms 100.0%
layouts/application 16 ms 6.3%
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... 23 ms 9.0%
SELECT id, name, email FROM users WHERE id = ? 6 ms 2.4%
home#slow 255 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... 25 ms 9.8%
home#slow 255 ms 100.0%
home#slow 255 ms 100.0%
SELECT * FROM users WHERE id = ? 29 ms 11.4%
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 > ? 32 ms 12.5%
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... 8 ms 3.1%
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 > ? 32 ms 12.5%
home#slow 255 ms 100.0%
layouts/application 29 ms 11.4%
home#slow 255 ms 100.0%
SELECT * FROM users WHERE id = ? 18 ms 7.1%
home#slow 255 ms 100.0%
home#slow 255 ms 100.0%
layouts/application 29 ms 11.4%
home#slow 255 ms 100.0%