Question2Answer (Q2A) is a free and open source php/MySql platform for Q&A sites.
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This site is running with latest Q2A v1.8.0, Feb-24-2018

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Q2A v1.8 Admin Panel Demo
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Enable compression Large pages (which is what you could have if you’re creating high-quality content) are often 100kb and more. As a result, they’re bulky and slow to download. The best way to speed their load time is to zip them—a technique called compression. Compression reduces the bandwidth of your pages, thereby reducing HTTP response. You do this with a tool called Gzip.
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Use a very fast hosting company I recently realised how much impact having a fast web host has when I migrated a client’s site to WPEngine. Without changing anything else, the site went from average to lightening speed.
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Use CDN A content delivery network (CDN) is a collection of web servers distributed across multiple locations to deliver content more efficiently to users. The server selected for delivering content to a specific user is typically based on a measure of network proximity. For example, the server with the fewest network hops or the server with the quickest response time is chosen. As you can see in the above image, it loads from different servers, based on the visitor's region. You can compare CDN hosting with standard web hosting here.
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Optimize images With images, you need to focus on three things: size, format and the src attribute. Image size Oversized images take longer to load, so it’s important that you keep your images as small as possible. Use image editing tools to: Crop your images to the correct size. For instance, if your page is 570px wide, resize the image to that width. Don’t just upload a 2000px-wide image and set the width parameter (width=”570”). This slows your page load time and creates a bad user experience. Reduce color depth to the lowest acceptable level. Remove image comments. Image format JPEG is your best option. PNG is also good, though older browsers may not fully support it. GIFs should only be used for small or simple graphics (less than 10×10 pixels, or a color palette of 3 or fewer colors) and for animated images. Do not use BMPs or TIFFs.
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