Request Details

Route
/slow GET
Timestamp
Sep 19, 2026 12:54 AM
Duration
328.47 ms
Status
201
Response Size
97 KB
Error
No

Performance Breakdown

Database
5.4% (6 queries)
View Rendering
6.0%
Application Logic
88.6%
Other Operations
0.0%
Total Operations
18
Slowest Operation
328.47 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 556.2ms 1112.4ms 1668.6ms 2224.8ms

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/index 24 ms 7.3%
home#slow 328 ms 100.0%
home/index 17 ms 5.2%
home/index 26 ms 7.9%
layouts/application 25 ms 7.6%
home#slow 328 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... 28 ms 8.5%
home#slow 328 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... 16 ms 4.9%
home#slow 328 ms 100.0%
home#slow 328 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... 32 ms 9.7%
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... 6 ms 1.8%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 28 ms 8.5%
posts/show 25 ms 7.6%
home#slow 328 ms 100.0%
SELECT name FROM users 10 ms 3.0%
posts/show 17 ms 5.2%