Request Details

Route
/slow GET
Timestamp
Sep 22, 2026 10:41 PM
Duration
486.46 ms
Status
204
Response Size
170 KB
Error
No

Performance Breakdown

Database
4.3% (6 queries)
View Rendering
4.2%
Application Logic
91.5%
Other Operations
0.0%
Total Operations
15
Slowest Operation
486.46 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 664.6ms 1329.2ms 1993.7ms 2658.3ms

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 posts WHERE created_at > ? 2 ms 0.4%
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... 35 ms 7.2%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 13 ms 2.7%
home#slow 486 ms 100.0%
posts/show 14 ms 2.9%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 20 ms 4.1%
home#slow 486 ms 100.0%
home#slow 486 ms 100.0%
users/index 39 ms 8.0%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 19 ms 3.9%
layouts/application 38 ms 7.8%
home#slow 486 ms 100.0%
home#slow 486 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 5.1%
users/index 21 ms 4.3%