Rails 3.0.9 in ruby 1.9.3 render partials performance

Question

I have the following hierarchy of partials rendering which results in a table

render: partial => table
- render: partial => row,: collection => rows
- ---- render: partial => cell,: collection => row.cells
- -------render: partial => "# {cell.partial}",: locals => {: item => cell.item}

In prodakshion renedering 5000 rows takes 12 seconds

At the same PC - "Web interface Oracle" draws the same 5000 lines in 2 seconds. That is 6 times faster.

What's the problem? How can i optimize rails performace ?

We are using the slim, but with haml it's the same Working on windows...

Moving partials to helper methods gives me 3x speed!

To optimize anything it helps to know what is slow and starting there, have you profiled the code? — Devin M
i've got a problem with profiling cause i am using windows as development platform. But all partials are like == item.text — Yegor Razumovsky

Yegor Razumovsky Yegor Razumovsky · Accepted Answer · 2013-01-29T11:39:34

here is the problem: small partials are not efficient. Use helpers instead.

When I changed "render small partial" to "call helper method" I got 5x rendering performance.

Sad but true