Request Details

Route
/slow GET
Timestamp
Sep 20, 2026 2:29 PM
Duration
302.04 ms
Status
200
Response Size
170 KB
Error
No

Performance Breakdown

Database
11.1% (11 queries)
View Rendering
13.1%
Application Logic
75.7%
Other Operations
0.0%
Total Operations
26
Slowest Operation
302.04 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 498.6ms 997.1ms 1495.7ms 1994.2ms

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
SELECT * FROM users WHERE id = ? 27 ms 8.9%
layouts/application 38 ms 12.6%
layouts/application 28 ms 9.3%
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 > ? 10 ms 3.3%
layouts/application 37 ms 12.2%
SELECT name FROM users 18 ms 6.0%
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 9.3%
SELECT users.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, SUM(posts.view_count) as total_views, AVG(posts.view_count) as avg_views, MIN(posts.created_at) as first_post, MAX(posts.created_at) as latest_post FR... 17 ms 5.6%
SELECT * FROM users WHERE id = ? 27 ms 8.9%
home#slow 302 ms 100.0%
home#slow 302 ms 100.0%
layouts/application 10 ms 3.3%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 19 ms 6.3%
layouts/application 25 ms 8.3%
home/index 16 ms 5.3%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 32 ms 10.6%
home#slow 302 ms 100.0%
users/index 26 ms 8.6%
SELECT name FROM users 7 ms 2.3%
layouts/application 26 ms 8.6%
users/index 31 ms 10.3%
layouts/application 25 ms 8.3%
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... 21 ms 7.0%
home#slow 302 ms 100.0%
SELECT users.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, SUM(posts.view_count) as total_views, AVG(posts.view_count) as avg_views, MIN(posts.created_at) as first_post, MAX(posts.created_at) as latest_post FR... 16 ms 5.3%
home#slow 302 ms 100.0%