Request Details

Route
/slow GET
Timestamp
Sep 14, 2026 6:42 AM
Duration
634.6 ms
Status
201
Response Size
110 KB
Error
No

Performance Breakdown

Database
8.5% (10 queries)
View Rendering
5.9%
Application Logic
85.6%
Other Operations
0.0%
Total Operations
20
Slowest Operation
634.6 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 555.7ms 1111.4ms 1667.1ms 2222.8ms

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
UPDATE posts SET view_count = view_count + ? WHERE published = ? 35 ms 5.5%
SELECT * FROM posts WHERE created_at > ? 19 ms 3.0%
SELECT * FROM posts WHERE created_at > ? 12 ms 1.9%
users/index 22 ms 3.5%
layouts/application 38 ms 6.0%
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... 3 ms 0.5%
users/index 24 ms 3.8%
layouts/application 7 ms 1.1%
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... 3 ms 0.5%
home#slow 635 ms 100.0%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 26 ms 4.1%
home#slow 635 ms 100.0%
home/index 9 ms 1.4%
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 > ? 23 ms 3.6%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 17 ms 2.7%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 20 ms 3.2%
home#slow 635 ms 100.0%
users/index 14 ms 2.2%
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 > ? 30 ms 4.7%
home/index 17 ms 2.7%