Request Details

Route
/slow GET
Timestamp
Sep 18, 2026 2:50 PM
Duration
305.2 ms
Status
200
Response Size
80 KB
Error
No

Performance Breakdown

Database
11.9% (12 queries)
View Rendering
10.8%
Application Logic
77.3%
Other Operations
0.0%
Total Operations
26
Slowest Operation
305.2 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 493.5ms 987.0ms 1480.5ms 1974.0ms

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
posts/show 35 ms 11.5%
users/index 13 ms 4.3%
home/index 38 ms 12.5%
SELECT name FROM users 13 ms 4.3%
home/index 23 ms 7.5%
layouts/application 20 ms 6.6%
SELECT * FROM posts WHERE created_at > ? 18 ms 5.9%
home#slow 305 ms 100.0%
layouts/application 12 ms 3.9%
layouts/application 12 ms 3.9%
layouts/application 35 ms 11.5%
layouts/application 25 ms 8.2%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 26 ms 8.5%
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 1.6%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 21 ms 6.9%
home#slow 305 ms 100.0%
SELECT name FROM users 32 ms 10.5%
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... 30 ms 9.8%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 34 ms 11.1%
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... 25 ms 8.2%
home#slow 305 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 9 ms 2.9%
home#slow 305 ms 100.0%
home#slow 305 ms 100.0%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 7 ms 2.3%
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... 15 ms 4.9%