Request Details

Route
/slow GET
Timestamp
Sep 22, 2026 1:17 AM
Duration
425.21 ms
Status
200
Response Size
170 KB
Error
No

Performance Breakdown

Database
1.6% (4 queries)
View Rendering
2.8%
Application Logic
95.6%
Other Operations
0.0%
Total Operations
18
Slowest Operation
425.21 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 889.9ms 1779.8ms 2669.7ms 3559.6ms

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
home#slow 425 ms 100.0%
home#slow 425 ms 100.0%
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... 10 ms 2.4%
home#slow 425 ms 100.0%
home#slow 425 ms 100.0%
home#slow 425 ms 100.0%
home/index 6 ms 1.4%
UPDATE posts SET title = ?, content = ?, updated_at = ? WHERE id = ? 1 ms 0.2%
users/index 14 ms 3.3%
home#slow 425 ms 100.0%
posts/show 38 ms 8.9%
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 > ? 25 ms 5.9%
home#slow 425 ms 100.0%
home/index 22 ms 5.2%
home#slow 425 ms 100.0%
layouts/application 12 ms 2.8%
home/index 9 ms 2.1%
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... 21 ms 4.9%