Request Details

Route
/slow GET
Timestamp
Sep 22, 2026 7:23 PM
Duration
588.81 ms
Status
201
Response Size
140 KB
Error
No

Performance Breakdown

Database
3.0% (11 queries)
View Rendering
2.0%
Application Logic
95.1%
Other Operations
0.0%
Total Operations
30
Slowest Operation
588.81 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 2012.6ms 4025.3ms 6037.9ms 8050.6ms

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
SELECT users.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, SUM(posts.view_count) as total_views, AVG(posts.view_count) as avg_views, MIN(posts.created_at) as first_post, MAX(posts.created_at) as latest_post FR... 6 ms 1.0%
SELECT * FROM users WHERE id = ? 12 ms 2.0%
SELECT name FROM users 24 ms 4.1%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
users/index 25 ms 4.2%
SELECT name FROM users 22 ms 3.7%
layouts/application 35 ms 5.9%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
home#slow 589 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... 13 ms 2.2%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 27 ms 4.6%
home#slow 589 ms 100.0%
users/index 37 ms 6.3%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
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 > ? 33 ms 5.6%
SELECT * FROM users WHERE id = ? 29 ms 4.9%
home#slow 589 ms 100.0%
home/index 18 ms 3.1%
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... 10 ms 1.7%
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... 28 ms 4.8%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
home#slow 589 ms 100.0%
home/index 9 ms 1.5%
SELECT id, name FROM users WHERE email = ? 34 ms 5.8%
users/index 34 ms 5.8%