Request Details

Route
/slow GET
Timestamp
Sep 18, 2026 4:38 PM
Duration
441.27 ms
Status
201
Response Size
110 KB
Error
No

Performance Breakdown

Database
2.1% (6 queries)
View Rendering
3.3%
Application Logic
94.6%
Other Operations
0.0%
Total Operations
26
Slowest Operation
441.27 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 1165.9ms 2331.8ms 3497.8ms 4663.7ms

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.*, posts.*, comments.*, COUNT(DISTINCT posts.id) as post_count, COUNT(DISTINCT comments.id) as comment_count, AVG(posts.view_count) as avg_views, MAX(comments.created_at) as latest_comment FROM users LEFT JOIN posts ON users.id = posts.use... 9 ms 2.0%
SELECT * FROM posts WHERE created_at > ? 25 ms 5.7%
home#slow 441 ms 100.0%
users/index 7 ms 1.6%
users/index 23 ms 5.2%
home#slow 441 ms 100.0%
home#slow 441 ms 100.0%
posts/show 8 ms 1.8%
home#slow 441 ms 100.0%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 32 ms 7.3%
home/index 6 ms 1.4%
home#slow 441 ms 100.0%
SELECT * FROM posts WHERE created_at > ? 14 ms 3.2%
SELECT * FROM comments WHERE post_id = ? ORDER BY created_at DESC LIMIT ? 1 ms 0.2%
home#slow 441 ms 100.0%
layouts/application 24 ms 5.4%
layouts/application 26 ms 5.9%
home#slow 441 ms 100.0%
home#slow 441 ms 100.0%
users/index 8 ms 1.8%
home/index 29 ms 6.6%
SELECT posts.title, posts.content, users.name FROM posts JOIN users ON posts.user_id = users.id WHERE posts.published = ? 18 ms 4.1%
users/index 5 ms 1.1%
home#slow 441 ms 100.0%
home#slow 441 ms 100.0%
home/index 16 ms 3.6%