Request Details

Route
/slow GET
Timestamp
Sep 17, 2026 11:04 PM
Duration
420.86 ms
Status
201
Response Size
120 KB
Error
No

Performance Breakdown

Database
4.2% (6 queries)
View Rendering
5.4%
Application Logic
90.3%
Other Operations
0.0%
Total Operations
16
Slowest Operation
420.86 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 582.6ms 1165.2ms 1747.7ms 2330.3ms

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... 5 ms 1.2%
home#slow 421 ms 100.0%
users/index 20 ms 4.8%
home#slow 421 ms 100.0%
home#slow 421 ms 100.0%
home/index 15 ms 3.6%
users/index 19 ms 4.5%
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... 3 ms 0.7%
SELECT * FROM posts WHERE title LIKE ? AND content LIKE ? AND LOWER(title) LIKE ? AND UPPER(content) LIKE ? 31 ms 7.4%
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 > ? 8 ms 1.9%
users/index 39 ms 9.3%
SELECT * FROM posts WHERE created_at > ? 32 ms 7.6%
posts/show 34 ms 8.1%
home#slow 421 ms 100.0%
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... 20 ms 4.8%
home#slow 421 ms 100.0%