Request Details

Route
/slow GET
Timestamp
Sep 12, 2026 7:47 AM
Duration
537.6 ms
Status
204
Response Size
61 KB
Error
No

Performance Breakdown

Database
1.2% (3 queries)
View Rendering
5.9%
Application Logic
92.8%
Other Operations
0.0%
Total Operations
20
Slowest Operation
537.6 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 1013.6ms 2027.1ms 3040.7ms 4054.2ms

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
posts/show 10 ms 1.9%
home#slow 538 ms 100.0%
home#slow 538 ms 100.0%
home/index 28 ms 5.2%
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... 18 ms 3.3%
posts/show 10 ms 1.9%
home/index 40 ms 7.4%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 18 ms 3.3%
users/index 32 ms 6.0%
layouts/application 12 ms 2.2%
home#slow 538 ms 100.0%
layouts/application 38 ms 7.1%
home#slow 538 ms 100.0%
posts/show 9 ms 1.7%
SELECT name FROM users 14 ms 2.6%
layouts/application 30 ms 5.6%
home#slow 538 ms 100.0%
users/index 32 ms 6.0%
home#slow 538 ms 100.0%