FAQ: Why are pages loading really slowly in the Web Viewer, especially when scrolling?

1.  The Web Viewer loads pages into memory, one at a time.
If you scroll quickly down the document, it has to load all those pages before it displays the one you stop at.  A quicker method therefore is to enter the page number directly into the Viewer’s toolbar.

2.  The browser you use will make a difference.
Firefox and Chrome will load documents faster than Internet Explorer or Edge.  So, if you are using IE or Edge try using a different browser.

3.  The type/contents of the PDF file will impact the load speed.
If the PDF file has lots of objects/images on the page or complex vectors which have not been optimized, then the browser will be slow in rendering them.  The document publisher should experiment with the optimization options available in Safeguard Web Publisher to optimize their PDF files for maximum speed.

4.  Your Internet connection speed is important.
If you have a slow download speed or unreliable connection this will reflect in the speed at which documents load.

When you click on a document, the request is sent to the Web Viewer server – this is not a direct connection, it jumps from node to node until it reaches it.  So, depending on your location, the request may need to jump through many nodes, thus delaying the response and making document load times longer. E.g. a user in the US will be nearer our hosted servers and documents will load faster than for a user in the UK and considerably faster than for a user in Australia.

You can test your Internet connection speed here: www.speedtest.net.  A good Internet connection will have a low value for the ping (8-12ms) and high ones for download (100 Mbps and up) and upload speeds (20 Mbps and up).  Please note that these values are for a server in the vicinity of the machine running the test, not for the Web Viewer server you are trying to access – the Web Viewer server will almost always be further away and thus, have a higher ping and lower download speeds.

Note for Document Publishers

When creating your PDF files make them as clean as possible with the minimum of embedded objects. For example, don’t embed PDFs into another file (say, an Illustrator file) and then save to PDF the final Illustrator file, or embed multiple PDFs within a single file.  Doing this type of embedding will slow the rendering right down or may prevent the pages loading altogether.  See guidelines for publishing PDF files for use with the Web Viewer.

If you want to be able to access documents faster in the Web Viewer and your clients are nearer to your location than to our hosted servers, you can try the Own Server option.  This will allow you to install the licensing server and the Web Viewer in your location, thus making it more responsive for you and your clients.