Request Details

Route
/slow GET
Timestamp
Sep 17, 2026 11:41 AM
Duration
452.37 ms
Status
204
Response Size
78 KB
Error
No

Performance Breakdown

Database
8.2% (7 queries)
View Rendering
7.9%
Application Logic
83.9%
Other Operations
0.0%
Total Operations
18
Slowest Operation
452.37 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 404.3ms 808.6ms 1212.8ms 1617.1ms

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
home#slow 452 ms 100.0%
posts/show 26 ms 5.7%
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... 7 ms 1.5%
home#slow 452 ms 100.0%
DELETE FROM posts WHERE id = ? 19 ms 4.2%
users/index 6 ms 1.3%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 19 ms 4.2%
home/index 11 ms 2.4%
layouts/application 37 ms 8.2%
layouts/application 7 ms 1.5%
users/index 9 ms 2.0%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 30 ms 6.6%
home#slow 452 ms 100.0%
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... 24 ms 5.3%
posts/show 10 ms 2.2%
posts/show 21 ms 4.6%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 17 ms 3.8%
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... 17 ms 3.8%