Request Details

Route
/slow GET
Timestamp
Sep 21, 2026 8:39 PM
Duration
449.83 ms
Status
201
Response Size
69 KB
Error
No

Performance Breakdown

Database
2.7% (4 queries)
View Rendering
8.3%
Application Logic
89.0%
Other Operations
0.0%
Total Operations
15
Slowest Operation
449.83 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 505.6ms 1011.2ms 1516.7ms 2022.3ms

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
home#slow 450 ms 100.0%
layouts/application 30 ms 6.7%
posts/show 9 ms 2.0%
home#slow 450 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 5.6%
home/index 30 ms 6.7%
posts/show 14 ms 3.1%
layouts/application 37 ms 8.2%
home#slow 450 ms 100.0%
home/index 17 ms 3.8%
SELECT name FROM users 3 ms 0.7%
users/index 31 ms 6.9%
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 > ? 20 ms 4.4%
home#slow 450 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... 7 ms 1.6%