Request Details

Route
/error_prone GET
Timestamp
Sep 15, 2026 4:14 AM
Duration
53.64 ms
Status
404
Response Size
1.2 KB
Error
No

Performance Breakdown

Database
20.2% (8 queries)
View Rendering
22.6%
Application Logic
57.2%
Other Operations
0.0%
Total Operations
18
Slowest Operation
53.64 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 117.3ms 234.6ms 351.9ms 469.2ms

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 > ? 20 ms 37.3%
SELECT users.* FROM users LEFT JOIN posts ON users.id = posts.user_id LEFT JOIN comments ON posts.id = comments.post_id WHERE users.active = ? AND posts.published = ? AND comments.approved = ? OR users.created_at > ? AND posts.created_at > ? AND commen... 4 ms 7.5%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 4 ms 7.5%
users/index 7 ms 13.0%
home/index 36 ms 67.1%
home#errors 54 ms 100.0%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 13 ms 24.2%
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 > ? 7 ms 13.0%
layouts/application 18 ms 33.6%
home#errors 54 ms 100.0%
home#errors 54 ms 100.0%
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... 2 ms 3.7%
layouts/application 30 ms 55.9%
home#errors 54 ms 100.0%
home#errors 54 ms 100.0%
home/index 15 ms 28.0%
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... 16 ms 29.8%
SELECT * FROM posts WHERE created_at > ? 29 ms 54.1%