Request Details

Route
/slow GET
Timestamp
Sep 10, 2026 9:28 AM
Duration
519.81 ms
Status
200
Response Size
120 KB
Error
No

Performance Breakdown

Database
5.0% (8 queries)
View Rendering
8.0%
Application Logic
87.0%
Other Operations
0.0%
Total Operations
22
Slowest Operation
519.81 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 746.5ms 1493.0ms 2239.6ms 2986.1ms

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 * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 23 ms 4.4%
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... 32 ms 6.2%
home#slow 520 ms 100.0%
posts/show 18 ms 3.5%
layouts/application 35 ms 6.7%
home#slow 520 ms 100.0%
users/index 32 ms 6.2%
DELETE FROM posts WHERE id = ? 24 ms 4.6%
home#slow 520 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... 3 ms 0.6%
home#slow 520 ms 100.0%
SELECT id, name FROM users WHERE email = ? 13 ms 2.5%
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... 21 ms 4.0%
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... 28 ms 5.4%
users/index 22 ms 4.2%
home#slow 520 ms 100.0%
home/index 32 ms 6.2%
home/index 37 ms 7.1%
users/index 19 ms 3.7%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 5 ms 1.0%
posts/show 18 ms 3.5%
posts/show 25 ms 4.8%