# Using partials - performance impact **URL:** \ **Category:** Rails\ **Created:** [April 25, 2007, 6:19pm UTC](https://www.ruby-forum.com/t/using-partials-performance-impact/92921 "2007-04-25T18:19:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [April 25, 2007, 6:19pm UTC](https://www.ruby-forum.com/t/using-partials-performance-impact/92921/1 "2007-04-25T18:19:39Z")
I love partials – no question about how you can logically separate the components of a view and of re-use it in many places. My question to the experts is - what (if any) performance impact does this have in production environment? It can’t be all good news right? Or is it? For example - Case 1 : All the view rhtml is stored in one file - no partials Case 2 : The same rhtml is generated using 10 partials with objects passed into partials using :locals. Note that the end result of case 1 and case 2 is the exact same html. How does case 1 compare with case 2? I do hope to do some tests and will share results with the forum. Thanks. JR ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [April 26, 2007, 6:41am UTC](https://www.ruby-forum.com/t/using-partials-performance-impact/92921/2 "2007-04-26T06:41:41Z")
Jason R. wrote: > My question to the experts is - what (if any) performance impact does > this have in production environment? It can’t be all good news right? Or > is it? There is some file IO associated with reading more than one file. I would recommend using partial where it makes logical sense. Let us know what your testing reveals. Sandy – ---
**Author:** ![jruyle](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/d2c977/32.png) [@jruyle](https://www.ruby-forum.com/u/jruyle)\ **Post date:** [April 26, 2007, 9:37am UTC](https://www.ruby-forum.com/t/using-partials-performance-impact/92921/3 "2007-04-26T09:37:16Z")
Good questions. While my test isnt the most detailed and doesnt have 10 different partials (only 2) It does demonstrate a “slight” speed increase for straight rhtml. I tested straight rhtml, partial with a collection and partial with local. The html for th collection is a little different…too lazy to fix. Feel free to take the app and modify it to make the test more detailed. You can download the app here: [http://www.tangofoxtrot.com/assets/2007/4/26/partial\_test.zip](http://www.tangofoxtrot.com/assets/2007/4/26/partial_test.zip) Uses sqlite3 and railsbench. I tested using railsbench perf\_run 200 -bm=main\_controller the results: loading environment 2.06392 page request total stddev% r/s ms/r main\_index 3.94083 9.4458 50.75 19.70 main\_collection\_index 4.41511 7.0973 45.30 22.08 main\_local\_index 4.24100 6.4577 47.16 21.21 all requests 12.59695 7.1636 47.63 20.99 - Richard On Apr 25, 9:19 am, Jason R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)