Request Details

Route
/slow GET
Timestamp
Sep 23, 2026 5:56 AM
Duration
351.68 ms
Status
204
Response Size
88 KB
Error
No

Performance Breakdown

Database
11.2% (8 queries)
View Rendering
9.1%
Application Logic
79.7%
Other Operations
0.0%
Total Operations
17
Slowest Operation
351.68 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 331.0ms 662.0ms 993.0ms 1324.1ms

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
layouts/application 18 ms 5.1%
SELECT name FROM users 24 ms 6.8%
SELECT users.* FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id WHERE users.active = ? AND posts.published = ? AND comments.approved = ? OR users.created_at > ? AND posts.created_at > ? AND commen... 20 ms 5.7%
home#slow 352 ms 100.0%
layouts/application 11 ms 3.1%
layouts/application 22 ms 6.3%
home#slow 352 ms 100.0%
SELECT users.* FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id WHERE users.active = ? AND posts.published = ? AND comments.approved = ? OR users.created_at > ? AND posts.created_at > ? AND commen... 16 ms 4.5%
DELETE FROM comments WHERE created_at < ? 35 ms 10.0%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 16 ms 4.5%
home#slow 352 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... 14 ms 4.0%
users/index 30 ms 8.5%
posts/show 6 ms 1.7%
users/index 34 ms 9.7%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 6 ms 1.7%
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... 17 ms 4.8%