Request Details

Route
/slow GET
Timestamp
Sep 14, 2026 9:59 AM
Duration
493.59 ms
Status
204
Response Size
150 KB
Error
No

Performance Breakdown

Database
3.0% (7 queries)
View Rendering
4.8%
Application Logic
92.2%
Other Operations
0.0%
Total Operations
24
Slowest Operation
493.59 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 1204.3ms 2408.7ms 3613.0ms 4817.3ms

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#slow 494 ms 100.0%
posts/show 32 ms 6.5%
users/index 29 ms 5.9%
home/index 27 ms 5.5%
home#slow 494 ms 100.0%
layouts/application 38 ms 7.7%
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... 27 ms 5.5%
home/index 23 ms 4.7%
users/index 28 ms 5.7%
home#slow 494 ms 100.0%
home/index 37 ms 7.5%
DELETE FROM comments WHERE created_at < ? 35 ms 7.1%
home#slow 494 ms 100.0%
home#slow 494 ms 100.0%
SELECT * FROM users WHERE id = ? 1 ms 0.2%
home#slow 494 ms 100.0%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 25 ms 5.1%
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 > ? 20 ms 4.1%
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... 9 ms 1.8%
home/index 17 ms 3.4%
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... 27 ms 5.5%
home#slow 494 ms 100.0%
home#slow 494 ms 100.0%
home#slow 494 ms 100.0%