Request Details

Route
/slow GET
Timestamp
Sep 10, 2026 7:45 PM
Duration
421.62 ms
Status
201
Response Size
75 KB
Error
No

Performance Breakdown

Database
7.4% (10 queries)
View Rendering
3.2%
Application Logic
89.3%
Other Operations
0.0%
Total Operations
21
Slowest Operation
421.62 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 825.8ms 1651.7ms 2477.5ms 3303.3ms

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#slow 422 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... 31 ms 7.4%
SELECT * FROM users WHERE id = ? 35 ms 8.3%
home#slow 422 ms 100.0%
home#slow 422 ms 100.0%
home#slow 422 ms 100.0%
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... 18 ms 4.3%
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... 33 ms 7.8%
posts/show 24 ms 5.7%
SELECT id, name, email FROM users WHERE id = ? 14 ms 3.3%
users/index 29 ms 6.9%
SELECT name FROM users 1 ms 0.2%
home#slow 422 ms 100.0%
layouts/application 31 ms 7.4%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 34 ms 8.1%
layouts/application 23 ms 5.5%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 28 ms 6.6%
home#slow 422 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 > ? 24 ms 5.7%
SELECT * FROM users WHERE id = ? 27 ms 6.4%
home#slow 422 ms 100.0%