Request Details

Route
/slow GET
Timestamp
Sep 09, 2026 2:28 PM
Duration
292.79 ms
Status
201
Response Size
150 KB
Error
No

Performance Breakdown

Database
4.6% (5 queries)
View Rendering
4.6%
Application Logic
90.8%
Other Operations
0.0%
Total Operations
16
Slowest Operation
292.79 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 483.7ms 967.4ms 1451.1ms 1934.7ms

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 12 ms 4.1%
home#slow 293 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... 5 ms 1.7%
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 > ? 24 ms 8.2%
layouts/application 10 ms 3.4%
SELECT * FROM users WHERE id = ? 12 ms 4.1%
home/index 40 ms 13.7%
home#slow 293 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... 26 ms 8.9%
home/index 14 ms 4.8%
layouts/application 13 ms 4.4%
home#slow 293 ms 100.0%
home#slow 293 ms 100.0%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 22 ms 7.5%
home#slow 293 ms 100.0%
home#slow 293 ms 100.0%