# Rails and ySlow **URL:** \ **Category:** Rails\ **Created:** [September 24, 2007, 10:38pm UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401 "2007-09-24T22:38:23Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 24, 2007, 10:38pm UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/1 "2007-09-24T22:38:23Z")
If anyone has followed Steve Soulder’s tips on optimizing web performance (Yahoo chief performance guy), his most important rule of thumb could be deadly to your rails app. My first blog post: [http://www.dominicson.com/web-2-0](http://www.dominicson.com/web-2-0) Dominic ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 25, 2007, 3:06am UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/2 "2007-09-25T03:06:54Z")
All my scripts and css are compress, merged and then gzipped and served from s3. This is all done via a task each time I deploy my app. I don’t have any problems with it. What are the problems, i don’t understand? On Sep 24, 1:38 pm, Dominic S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 25, 2007, 5:14am UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/3 "2007-09-25T05:14:38Z")
I thought it was fine also. Logs seemed active. Then users started complaining. Then I checked on as many computers that my js would load correctly. out of 5 computers, each running both IE and FF, one of them would fail to load the js correctly. I’m just not going to take the risk… eggie5 wrote: > All my scripts and css are compress, merged and then gzipped and > served from s3. This is all done via a task each time I deploy my app. > > I don’t have any problems with it. What are the problems, i don’t > understand? > > On Sep 24, 1:38 pm, Dominic S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 25, 2007, 6:15am UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/4 "2007-09-25T06:15:11Z")
Oh, so it’s a compressor issue. A lot of the compressors I was experimenting with produced bad JS, especially with more advanced JS. The compressed js is also prone to errors just because of the fact that javascript is such a flexible language (not rigid in it’s syntax). It’s not hard to try out the results in all the browser/os combinations or FF/IE/S on windows/osx. It just seems like what you’re saying is a cop-out. Anyways, I suggest using dojo compressor. On Sep 24, 8:14 pm, Dominic S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 25, 2007, 11:59pm UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/5 "2007-09-25T23:59:38Z")
When my deploy script runs, just builds the string path for the css file and inserts it into the rhtml page as html. ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 25, 2007, 5:49pm UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/6 "2007-09-25T17:49:00Z")
Eggie5, you mention serving your css and js files from S3. I tried that before and it really slowed my site down. I served it by setting config.action\_controller.asset\_host = my.s3.bucket in config/ environment/production.rb. How are you serving these files? ---
**Author:** ![eddiewould](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/e/b5e925/32.png) [@eddiewould](https://www.ruby-forum.com/u/eddiewould)\ **Post date:** [September 26, 2007, 7:34am UTC](https://www.ruby-forum.com/t/rails-and-yslow/115401/7 "2007-09-26T07:34:56Z")
OH, and it’s also CRITICAL that when you upload the files to s3 that you set the content-types to text/javascript and text/css respectively or else when they’re severed they will be ignored by in certain circumstances. On Sep 24, 8:14 pm, Dominic S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)