Request Details

Route
/error_prone GET
Timestamp
Sep 23, 2026 3:56 AM
Duration
20.11 ms
Status
404
Response Size
1.3 KB
Error
No

Performance Breakdown

Database
57.0% (9 queries)
View Rendering
23.9%
Application Logic
19.0%
Other Operations
0.0%
Total Operations
15
Slowest Operation
39.0 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 79.3ms 158.7ms 238.0ms 317.3ms

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#errors 20 ms 100.0%
layouts/application 28 ms 139.2%
SELECT name FROM users 32 ms 159.1%
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... 34 ms 169.1%
SELECT * FROM posts WHERE created_at > ? 30 ms 149.2%
layouts/application 39 ms 193.9%
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... 31 ms 154.1%
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... 3 ms 14.9%
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... 24 ms 119.3%
SELECT name FROM users 18 ms 89.5%
home#errors 20 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 7 ms 34.8%
home/index 9 ms 44.8%
SELECT name FROM users 2 ms 9.9%
home#errors 20 ms 100.0%