Request Details

Route
/slow GET
Timestamp
Sep 20, 2026 6:22 AM
Duration
370.97 ms
Status
204
Response Size
180 KB
Error
No

Performance Breakdown

Database
3.7% (6 queries)
View Rendering
3.7%
Application Logic
92.7%
Other Operations
0.0%
Total Operations
22
Slowest Operation
370.97 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 1000.9ms 2001.8ms 3002.8ms 4003.7ms

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 371 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... 27 ms 7.3%
home#slow 371 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 33 ms 8.9%
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... 17 ms 4.6%
home#slow 371 ms 100.0%
home#slow 371 ms 100.0%
posts/show 31 ms 8.4%
SELECT posts.title, posts.content, users.name FROM posts JOIN users ON posts.user_id = users.id WHERE posts.published = ? 33 ms 8.9%
home#slow 371 ms 100.0%
layouts/application 36 ms 9.7%
posts/show 22 ms 5.9%
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... 15 ms 4.0%
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 > ? 22 ms 5.9%
layouts/application 27 ms 7.3%
home#slow 371 ms 100.0%
home#slow 371 ms 100.0%
home#slow 371 ms 100.0%
home#slow 371 ms 100.0%
layouts/application 15 ms 4.0%
posts/show 16 ms 4.3%
home#slow 371 ms 100.0%