Regarding performance, there are a wide variety of tools that you can use to find areas that might be causing sluggish or slower performance within your Web Applications. I usually always recommend developers to use a tool like Google's PageSpeed Insights or Yahoo's YSlow service, both of which analyze various aspects of a site and find areas that can be optimized :
Consider Using a Third-Party Analyzer
I would recommend running something an analyzer like one of the following on your site :
- Using Google PageInsights - Google's PageInsights can help you find areas of improvement and offers suggestions on how to get your site running faster.
- Using Yahoo's YSlow Analyzer - Very similar to Google's PageInsights, YSlow looks for areas that you can check to improve the performance of your site.
It will provide you with any major concerns that might be slowing down performance on your site and how to resolve these issues. You might see something like the following after running it, which will let you know what images you need to consider optimizing and the amount of size that you will save :
Image may be NSFW.
Clik here to view.
A Few Additional Recommendations
A few more generic recommendations or things to check would be :
- Ensure that you are using minified versions of your Javascript files.
- Try running every image on your site through some type of optimizer (such as kraken.io)
- Try using the Developer Tools (F12) within your browser and check the Console area to see if there are any errors that are present. These may reveal some issues that could be slowing things down.
One Additional Consideration
If you want an excellent resource that encompasses a variety of methods to improve your website or web application, I cannot recommend the Web Developer Checklist enough. There is also an ASP.NET-specific version available on the site as well and one that focuses specifically on ASP.NET Performance. It's probably one of the best single resources that I have found for improving nearly all aspects of a website or web application.
The Main Issue
The primary issue here however is the time it is taking to serve the page from your server. How are you currently hosting this? Any request to your site is taking between 15s-17s, which is absurd. Depending on how you are currently hosting it, you may want to consider using a third-party provider (if you are hosting it yourself) as the performance might be quite a bit better.
Without knowing the exact details of this, it would be difficult to determine why it's taking so long.
