Request Details

Route
/slow GET
Timestamp
Sep 09, 2026 5:56 PM
Duration
405.0 ms
Status
200
Response Size
130 KB
Error
No

Performance Breakdown

Database
4.5% (4 queries)
View Rendering
11.6%
Application Logic
83.9%
Other Operations
0.0%
Total Operations
16
Slowest Operation
405.0 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 483.0ms 966.0ms 1449.0ms 1932.0ms

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 * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 5 ms 1.2%
home#slow 405 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... 17 ms 4.2%
users/index 24 ms 5.9%
home#slow 405 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... 31 ms 7.7%
home/index 31 ms 7.7%
posts/show 38 ms 9.4%
home#slow 405 ms 100.0%
home#slow 405 ms 100.0%
users/index 25 ms 6.2%
SELECT * FROM posts WHERE created_at > ? 34 ms 8.4%
users/index 26 ms 6.4%
posts/show 39 ms 9.6%
posts/show 6 ms 1.5%
layouts/application 36 ms 8.9%