Request Details

Route
/slow GET
Timestamp
Sep 09, 2026 6:03 AM
Duration
293.09 ms
Status
204
Response Size
180 KB
Error
No

Performance Breakdown

Database
6.2% (12 queries)
View Rendering
3.3%
Application Logic
90.5%
Other Operations
0.0%
Total Operations
25
Slowest Operation
293.09 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 728.5ms 1456.9ms 2185.4ms 2913.8ms

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
SELECT * FROM users WHERE id = ? 21 ms 7.2%
SELECT * FROM users WHERE id = ? 9 ms 3.1%
home#slow 293 ms 100.0%
users/index 37 ms 12.6%
home#slow 293 ms 100.0%
home#slow 293 ms 100.0%
posts/show 8 ms 2.7%
SELECT users.*, posts.*, comments.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, AVG(posts.view_count) as avg_views, MAX(comments.created_at) as latest_comment FROM users LEFT JOIN posts ON users.id = posts.use... 15 ms 5.1%
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... 10 ms 3.4%
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... 20 ms 6.8%
home#slow 293 ms 100.0%
home#slow 293 ms 100.0%
home#slow 293 ms 100.0%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 33 ms 11.3%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 25 ms 8.5%
home#slow 293 ms 100.0%
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 > ? 9 ms 3.1%
home#slow 293 ms 100.0%
users/index 22 ms 7.5%
posts/show 29 ms 9.9%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 7 ms 2.4%
home#slow 293 ms 100.0%
SELECT * FROM users WHERE id = ? 13 ms 4.4%
SELECT name FROM users 4 ms 1.4%
SELECT * FROM posts WHERE created_at > ? 14 ms 4.8%