Request Details

Route
/slow GET
Timestamp
Sep 22, 2026 2:05 PM
Duration
537.73 ms
Status
201
Response Size
190 KB
Error
No

Performance Breakdown

Database
4.0% (7 queries)
View Rendering
6.3%
Application Logic
89.7%
Other Operations
0.0%
Total Operations
22
Slowest Operation
537.73 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 899.6ms 1799.2ms 2698.8ms 3598.4ms

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 17 ms 3.2%
users/index 33 ms 6.1%
SELECT * FROM users WHERE id = ? 29 ms 5.4%
home/index 11 ms 2.0%
posts/show 26 ms 4.8%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 31 ms 5.8%
home#slow 538 ms 100.0%
home#slow 538 ms 100.0%
posts/show 39 ms 7.3%
home#slow 538 ms 100.0%
home#slow 538 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... 33 ms 6.1%
home/index 32 ms 6.0%
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... 11 ms 2.0%
SELECT * FROM posts WHERE created_at > ? 29 ms 5.4%
home/index 6 ms 1.1%
home#slow 538 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 2 ms 0.4%
layouts/application 38 ms 7.1%
home#slow 538 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... 10 ms 1.9%
home/index 25 ms 4.6%