Why my site is so slow?

I would advice you code everything from scratch than using any available framework or CMS...i have a website that has 100,000 members but the site is still working normally even-though it is hosted in just a normal shared hosting account.

Hard to say without more details. Have you got logs with timings for different parts of your code? That would help you narrow down areas of focus.

Have you reviewed Garbage Collection (gc ) logs? Use settings like java -XX:+PrintGCDetails -Xloggc:logs/gc.log ... to get details about how your JVM is handling memory.

Is it a shared hosting site? If so, I would guess the ISPs database server is the cause. Drupal and Wordpress make a lot of database calls that can really slow things down.

There are speed test sites that show you how fast your site is loading and what elements of your site are taking the longest, you should find and use one.

I can't honestly give you an answer without having the address, but to get started you should run thru PageSpeed Insights

try the "yslow" addon for firefox abd chrome.

it will give you all the reasons why its slow, and how you can fix it

normally the database is the slowest part. How much ram do you have? How big is the db?

as to page loading, try to set expiry date of css and js files as well.

you can cache your js and css file so that way it take one time load whenever a user visit you site it'll increase your website speed.

Check your hosting. Most probably your hosting issue.

To optimize your site, you have to understand where the problems lie. Generally I break this down into 3 areas:

Backend

Your server hardware, application stack (e.g. apache/php/mysql), and the application itself (Drupal).

Frontend
This deals more with site design and layout. How many HTTP requests are needed, how js/css is loaded and similar design oriented items.

Delivery
This is more about the network used to deliver your site, e.g. cloudflare or similar CDN services and DNS lookup speeds.


Testing
The trick to site optimization is to test with the right tools. I start with general tools like:
WebPagetest - Website Performance and Optimization Test
You can quickly get an overview of where bottlenecks may reside.

Things like Time to First Byte, HTTP Compression and expires headers are controlled on the backend.

Things like having 15 CSS and 20 JS files on your page would be on the frontend.

Slow DNS would be a delivery/network issue.

Getting Dirty
Once you have an overview, you will need more detailed tools to find the bottlenecks.

Backend Tools
On the backend on server tools like top, mytop, sysstat, apachetop, mysqltuner and similar command line utilities (at least on Linux) will help at the application stack level

Once you move into your code itself, things like NewRelic can help you pinpoint specific slow functions or MySQL statements.

Front End Tools
On the frontend, I use Firebug, Pagespeed and similar tools. These are built right into your browser and can help you spot blocking css/js.

Webpagetest.org also does a good job of spotting poorly optimized images. Tools like Yahoo's smushit as well as pngcrush, ImageMagic and jpegtrans can help here.

Delivery Tools
Webpagtest.org, Pingdom, DNSStuff, Watchmouse can all help you debug connection and DNS timing issues. This is usually the least problematic unless you have incorrectly configured DNS.

Where to Start
Usually there are improvements to be made in all 3 areas. As you improve one area another may become the bottleneck. The process is iterative and can be time consuming.

You should let the testing tell you where the most problematic areas are, but I also recommend you start with your strengths.

As a Linux sysadmin, I start on backend issues as I can quickly knock out problems in Apache, PHP, and MySQL, especially if they've not been optimized previously. I can often get cache headers, compression and time to first byte problems fixed in a few hours of work and these can have huge improvements on site speed.

Test Tool Caution
Just a final note about various test tools.

While most provide some type of score or grade, I find the scores somewhat useless. Many tools average these scores over all assets on your site - some may be on 3rd parties that you do not control. So pay attention to details. For example, getting a "C" on compression or caching could be due to 3rd party tracking codes. So pay attention to the details.

Also, note that these tools typically make just 1 page request. Make sure you do a few tests to get an idea of the average result. You don't want to start optimizing using a test that may not be representative.

Better monitor tools, Neustar/Gomez/NewRelic, offer paid solutions so you can get averages over time and from different locations. If performance is critical to your business investing in these during the optimization work can be useful.

You could also reduce the image size with Yahoo! Smush.it™.

I would look at your website in a speed tester first. Try minifying your files and if its your database I am sure there is something to minimise this.

Do you have lots of images loading on your website? That could slow down your site.

Hi,
I had a really slow site so I moved to hosting my files in cloud using amazon. AWS services are a great way of creating a service as pay as you go.

Some time it occurs due to the coding error in it.

site is slow yet you have drupal links in profile? Whats wrong here?

You can use some good tools which can help you to make your site faster - Pingdome is good website where you can check your website

https://drupal.org/node/131189 Check this out.. This is the community conversation of Drupal. If the problem still persist, concern to your website developer.

You should check your images whether its optimized or not and if you are using database for dynamic contents check the optimization of sql statements

Not many people have mentioned hardware here. Are you on shared hosting or a private VPS? It may be the actual hardware you're hosting your site on which could be slow, and not the content of your site.

What type of hosting you are using? server also one factor why your site is slow..

Are you displaying any third party ads and/or feeds? HTTP requests to other sites can slow down the load of the page. Use Firebug's NET panel to see what is taking so long to load. Click "All". You could always use JavaScript to load a feed last into your DOM.

First of all check your network connection and also the backend and the hosting.Some time it will taken more time for loading.