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    <p>Here are my answers for your questions:</p> <p>1) You should use images as less as possible, because images reduce the page load time a lot. Should use CSS instead, just use image where we can't use CSS. Many pieces of images should be joined in a single one to reduce the number of request (http://www.w3schools.com/css/css_image_sprites.asp).</p> <p>2) There are a lot of tools that can help us monitor and improve the performance of our app. The two important things we can inspect and improve are the page load time (include static assets like images, css, js,...) and benchmark of the backend code (Ruby code).</p> <p>I recommend these two tools to do the above measurement:</p> <ul> <li>YSlow (add-on for Firefox and Chrome): measure page load time with a lot of instruction of improvement. </li> <li>New Relic: tool to measure backend code: <a href="https://github.com/newrelic/rpm" rel="nofollow">https://github.com/newrelic/rpm</a></li> </ul> <p>Another tip, you should run Rails in development environment when optimizing code for performance. Because the app runs more slowly in dev mode than in production mode. If it runs fast in dev mode, it will run faster in production mode ;).</p> <p>3) The way you are using assets compression is not wrong but strange :), because you are trying to compress assets in development mode (configure in development.rb) while we should do it in production mode instead (configure in production.rb).</p> <p>4) It depends on your choice. But, yes, you should place all images in assets/images/ folder.</p>
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    1. POHow to inspect and improve site performance ? ( Rails )
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    1. COthanks. If I will use images as backgrounds it will be better or doesn't metter ? I just adding them in development.rb to test them) Or I should just choose environment when running server ?
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    2. COAlso I forgot to ask you about Bootstrap: I'm using it, but also downloaded js files, but I have bootstrap gem also. Can I improve something in this approach ?
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    3. CODo you mean Twitter Bootstrap and Twitter Bootstrap Rails gem?
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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