Request Details

Route
/slow GET
Timestamp
Sep 23, 2026 3:48 AM
Duration
171.56 ms
Status
204
Response Size
170 KB
Error
No

Performance Breakdown

Database
10.3% (8 queries)
View Rendering
9.5%
Application Logic
80.1%
Other Operations
0.0%
Total Operations
20
Slowest Operation
171.56 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 374.7ms 749.5ms 1124.2ms 1498.9ms

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 7 ms 4.1%
home#slow 172 ms 100.0%
SELECT * FROM users WHERE id = ? 32 ms 18.7%
home#slow 172 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... 17 ms 9.9%
home/index 36 ms 21.0%
home#slow 172 ms 100.0%
home/index 37 ms 21.6%
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... 19 ms 11.1%
layouts/application 39 ms 22.7%
home#slow 172 ms 100.0%
home#slow 172 ms 100.0%
SELECT name FROM users 14 ms 8.2%
SELECT id, name, email FROM users WHERE id = ? 8 ms 4.7%
layouts/application 24 ms 14.0%
home#slow 172 ms 100.0%
home#slow 172 ms 100.0%
SELECT * FROM users WHERE id = ? 28 ms 16.3%
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 2.9%
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 18.7%