Request Details

Route
/slow GET
Timestamp
Sep 15, 2026 3:56 PM
Duration
422.35 ms
Status
201
Response Size
200 KB
Error
No

Performance Breakdown

Database
3.8% (5 queries)
View Rendering
11.3%
Application Logic
85.0%
Other Operations
0.0%
Total Operations
19
Slowest Operation
422.35 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 497.1ms 994.2ms 1491.3ms 1988.4ms

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
posts/show 34 ms 8.1%
users/index 10 ms 2.4%
DELETE FROM comments WHERE created_at < ? 27 ms 6.4%
posts/show 5 ms 1.2%
posts/show 32 ms 7.6%
home#slow 422 ms 100.0%
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... 7 ms 1.7%
users/index 18 ms 4.3%
users/index 18 ms 4.3%
layouts/application 18 ms 4.3%
home#slow 422 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... 25 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... 5 ms 1.2%
posts/show 15 ms 3.6%
posts/show 34 ms 8.1%
home#slow 422 ms 100.0%
home#slow 422 ms 100.0%
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... 11 ms 2.6%
home/index 40 ms 9.5%