Request Details

Route
/slow GET
Timestamp
Sep 13, 2026 4:30 AM
Duration
253.68 ms
Status
200
Response Size
100 KB
Error
No

Performance Breakdown

Database
7.3% (9 queries)
View Rendering
11.5%
Application Logic
81.3%
Other Operations
0.0%
Total Operations
28
Slowest Operation
253.68 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 624.4ms 1248.7ms 1873.1ms 2497.4ms

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
layouts/application 22 ms 8.7%
layouts/application 28 ms 11.0%
SELECT * FROM posts WHERE created_at > ? 30 ms 11.8%
home#slow 254 ms 100.0%
home#slow 254 ms 100.0%
posts/show 9 ms 3.5%
home#slow 254 ms 100.0%
users/index 12 ms 4.7%
home/index 38 ms 15.0%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 12 ms 4.7%
home#slow 254 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 31 ms 12.2%
home#slow 254 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... 12 ms 4.7%
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 > ? 29 ms 11.4%
home#slow 254 ms 100.0%
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... 1 ms 0.4%
users/index 39 ms 15.4%
posts/show 38 ms 15.0%
SELECT * FROM users WHERE id = ? 21 ms 8.3%
users/index 34 ms 13.4%
SELECT name FROM users 25 ms 9.9%
layouts/application 11 ms 4.3%
home/index 37 ms 14.6%
home#slow 254 ms 100.0%
home#slow 254 ms 100.0%
SELECT name FROM users 21 ms 8.3%
users/index 18 ms 7.1%