Request Details

Route
/slow GET
Timestamp
Sep 10, 2026 8:05 AM
Duration
237.53 ms
Status
204
Response Size
110 KB
Error
No

Performance Breakdown

Database
5.4% (5 queries)
View Rendering
11.5%
Application Logic
83.1%
Other Operations
0.0%
Total Operations
21
Slowest Operation
237.53 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 500.4ms 1000.9ms 1501.3ms 2001.7ms

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 name FROM users 19 ms 8.0%
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... 24 ms 10.1%
home/index 9 ms 3.8%
layouts/application 38 ms 16.0%
home#slow 238 ms 100.0%
home#slow 238 ms 100.0%
home#slow 238 ms 100.0%
home#slow 238 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 > ? 28 ms 11.8%
layouts/application 28 ms 11.8%
layouts/application 21 ms 8.8%
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... 17 ms 7.2%
layouts/application 20 ms 8.4%
home/index 39 ms 16.4%
users/index 37 ms 15.6%
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... 21 ms 8.8%
layouts/application 11 ms 4.6%
home#slow 238 ms 100.0%
home#slow 238 ms 100.0%
home/index 27 ms 11.4%
home#slow 238 ms 100.0%