Request Details

Route
/slow GET
Timestamp
Sep 21, 2026 9:47 AM
Duration
426.36 ms
Status
204
Response Size
77 KB
Error
No

Performance Breakdown

Database
10.7% (10 queries)
View Rendering
3.7%
Application Logic
85.7%
Other Operations
0.0%
Total Operations
18
Slowest Operation
426.36 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 497.6ms 995.2ms 1492.8ms 1990.4ms

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
users/index 33 ms 7.7%
layouts/application 16 ms 3.8%
home#slow 426 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... 30 ms 7.0%
SELECT id, name FROM users WHERE email = ? 30 ms 7.0%
SELECT * FROM posts WHERE created_at > ? 9 ms 2.1%
SELECT * FROM posts WHERE user_id = ? ORDER BY created_at DESC LIMIT ? 33 ms 7.7%
SELECT * FROM users WHERE id = ? 32 ms 7.5%
SELECT * FROM posts WHERE created_at > ? 5 ms 1.2%
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... 5 ms 1.2%
home#slow 426 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 26 ms 6.1%
layouts/application 19 ms 4.5%
home#slow 426 ms 100.0%
posts/show 5 ms 1.2%
home#slow 426 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 > ? 27 ms 6.3%
UPDATE posts SET view_count = view_count + ? WHERE published = ? 15 ms 3.5%