Request Details

Route
/slow GET
Timestamp
Sep 09, 2026 3:43 PM
Duration
311.6 ms
Status
204
Response Size
71 KB
Error
No

Performance Breakdown

Database
3.2% (9 queries)
View Rendering
5.0%
Application Logic
91.8%
Other Operations
0.0%
Total Operations
27
Slowest Operation
311.6 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 848.5ms 1697.0ms 2545.5ms 3394.0ms

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 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... 2 ms 0.6%
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... 35 ms 11.2%
home#slow 312 ms 100.0%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 10 ms 3.2%
posts/show 15 ms 4.8%
home#slow 312 ms 100.0%
users/index 18 ms 5.8%
home#slow 312 ms 100.0%
home#slow 312 ms 100.0%
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... 9 ms 2.9%
home#slow 312 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 13 ms 4.2%
posts/show 30 ms 9.6%
home#slow 312 ms 100.0%
home#slow 312 ms 100.0%
layouts/application 15 ms 4.8%
SELECT * FROM posts WHERE created_at > ? 2 ms 0.6%
SELECT name FROM users 3 ms 1.0%
posts/show 11 ms 3.5%
layouts/application 36 ms 11.6%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 7 ms 2.2%
home#slow 312 ms 100.0%
home#slow 312 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... 26 ms 8.3%
home#slow 312 ms 100.0%
users/index 23 ms 7.4%
users/index 23 ms 7.4%