Request Details

Route
/slow GET
Timestamp
Sep 10, 2026 9:14 AM
Duration
508.51 ms
Status
201
Response Size
50 KB
Error
No

Performance Breakdown

Database
1.7% (4 queries)
View Rendering
4.8%
Application Logic
93.5%
Other Operations
0.0%
Total Operations
21
Slowest Operation
508.51 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 1223.6ms 2447.3ms 3670.9ms 4894.6ms

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/index 28 ms 5.5%
home#slow 509 ms 100.0%
users/index 29 ms 5.7%
layouts/application 34 ms 6.7%
home/index 27 ms 5.3%
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 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... 30 ms 5.9%
home#slow 509 ms 100.0%
home#slow 509 ms 100.0%
SELECT * FROM users WHERE id = ? 12 ms 2.4%
home#slow 509 ms 100.0%
posts/show 37 ms 7.3%
home/index 39 ms 7.7%
home#slow 509 ms 100.0%
layouts/application 5 ms 1.0%
posts/show 37 ms 7.3%
home#slow 509 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... 10 ms 2.0%
home#slow 509 ms 100.0%
home#slow 509 ms 100.0%
home#slow 509 ms 100.0%