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PPO seems slow today - what could cause this?

There are few things as frustrating as working on an application that is not responsive. Since we want you to have the best experience possible, we have put together this FAQ to help you get to the bottom of slow PPO response.

Before we get into the details of what may be impacting on performance, let us look at what performance you should be experiencing.  Generally speaking any page should load within less than 3 seconds, e.g. your Home Page, a project list, etc.  Certain pages, such as the Administration page and the Report Criteria page (which do not contain significant data) should load in under a second.

So what are some of the things that influence your perceived performance of PPO? The following is not a comprehensive list but should give you a starting point: 

1. Your connection speed to the internet / your ISP;

2. The connection speed between your ISP and our servers;

3. The amount of data that is stored on your instance;

4. The amount and complexity of data that you are retrieving;

5. There is a problem in the data centre where our servers are hosted or with a PPO server.

 Let us look at each of these in more detail: 

1. Your connection speed to the internet

This is probably the most common reason why users may experience PPO as being slow and unfortunately it is the one over which we have the least amount of control.  Common reasons why your connection may be slow include:

1.a)      You are connecting to the internet through a mobile connection with limited connectivity or low bandwidth e.g. Edge.

Diagnosing: Check general web site performance to other common internet sites, e.g. www.cnn.com, www.news24.com. Are they also slow? Try both local and international sites.

Resolution: Unfortunately this is a fairly common occurrence (especially in Africa) and is unfortunately beyond our control. If this happens often, you may want to consider switching to an alternative mobile service provider which has better coverage in your area.

1.b)      You are connecting through a corporate network with low internet bandwidth

Diagnosing: Check general web site performance to other common internet sites, e.g. www.cnn.com, www.news24.com. Are they also slow? Try both local and international sites.

Resolution: PPO’s bandwidth utilisation is very modest. When clients have problems it is usually as a result of the fact that PPO users are competing with other internet users for bandwidth (i.e. against YouTube, news sites, etc). The responsiveness of PPO is therefore very much a function of how internet traffic is managed within the client organisation. Today, most routers allow HTTP traffic to be prioritised on the basis of the destination URL. Alternatively, proxy servers or other bandwidth management devices can be used to filter and prioritise traffic. Talk to your IT department. We would be happy to provide them with additional information regarding PPO’s bandwidth requirements. 

2. The connection speed between your ISP and our servers

The internet is a complex and messy place. When you refresh a page on PPO your request is being routed through dozens of servers.  If any of those links (or hops) are slow, you will feel the impact. From our side we monitor our PPO servers from various locations in the world to help identify if there is a problem and will post on Twitter if there is a general problem with one of the major network routes.

Diagnosing: Although other common web sites may be performing well, the specific path to PPO may be slow.  First check our Twitter site to see if we have posted any information about a generally reported problem. Next you can check the same information we are receiving about our server response times by clicking on the PPO Uptime button on our website (https://www.go2ppo.com/incidents/).

Next you can run what is called a ping test from your computer to our server.  To do this, open a command prompt (press the Windows Key and R on your keyboard, type cmd and press ENTER). At the command prompt, type ping www.ppolive.com and press enter. You should see something similar to the image below:

2014-07-31_102823.png

Your average round trip time may vary (184 milliseconds in the image above), but it should be less than 400ms.

If your round trip time is significantly longer or times out, the next thing to try is to determine where things are going wrong.  Still from the command prompt, type tracert www.ppolive.com and press ENTER.  You should see something similar to the image below:

2014-07-31_105435.png

What tracert does is show the time that it took to each of the servers sitting between you and the PPO server.  In the above screenshot concentrate on the columns containing the numbers ending with ms (milliseconds). If the requests time out near the start of the list it likely indicates a problem with your ISP (ignore lines with asteriks in them (these are devices that do not respond to pings). If it times out in the middle of the list, it is likely a general problem on the internet. If it times out near the end of the list, it probably indicates a problem within our data centre.

Resolution:  If we have not posted anything on Twitter and your ping test is longer than 500ms, make screen shots of the ping and tracert tests and send it to the PPO Support Desk. 

3. The amount and complexity of data that is stored on your instance

PPO has been designed to handle large amounts of data but under certain circumstances it can start impacting on the performance.

Diagnosing and resolving:

3.a)      If only certain pages are slow, especially list pages and there are no calculated fields on the entity, check how many records are being retrieved (the number of items in the list is shown towards the top right-hand corner of the list header).  If this is more than 100 000 items, this could be impacting performance. On the project view page performance could also be impacted if there are one or more lists with a large number of items.

Resolving:  The best way to avoid performance impacts from large amounts of data is to use filters appropriately so that only the necessary data is retrieved. On lists pages, use the criteria and set up personal filters to reduce the amount of data retrieved to only that which you are interested in. If you are the administrator of the system ensure that global and user group filters are appropriate so that users only see relevant information

3.b)      If only certain pages are slow check for drop down boxes that have a large number of items in them (1000s of items). You will typically find this on list pages (in the criteria section) or on entity edit pages. Although this does not usually have a big impact on our servers, it means that a great deal of data is being transmitted to your browser. In these cases the amount of memory on your machine and its CPU power starts becoming a factor.  It also exacerbates any bandwidth problems that you may have.

Resolution: If you have very large drop downs (i.e. custom lists with a large number of items in them) it is recommended that you do not use these fields as criteria on your list pages and that you use dependencies where appropriate.  Ultimately though we do not recommend using very large dropdowns – consider rather using a text field (possibly with custom validation).

3.c)       If only certain pages are slow, especially list pages, and the number of records being retrieved is modest (less than 10 000 items) the problem may be that you have a large number of calculated fields or very complicated calculated fields.  In many cases very complex calculated fields have been implemented on the Projects entity which look at all the other data on PPO, e.g. Costs, Tasks, Risks, etc. in order to do project prioritisation or project health calculations. These calculations can be very processor intensive.  It is possible that when the fields were initially implemented the amount of data in the system was small and the performance issue was not noticed.  However as time goes by and more and more data is loaded, PPO becomes slower and slower.

Resolution: In many cases this can be addressed by optimising the way in which the calculations are done or by implementing custom indexes. Please log a support call and out technical team will assist you. 

4. Problems in our data centres or with a PPO server

This is usually the most unlikely of all the reasons that PPO is slow since we do extensive monitoring of our infrastructure.  It would also likely impact all users and we would therefore quickly become aware of the problem.

Diagnosing:

If you have ruled out all the other possibilities described above and you believe it is a problem with the PPO server, please first check the Twitter site to ensure that we have not already identified the problem. If you are still convinced it is a problem with PPO then please feel free to contact our Support Desk. 

General guidelines

If you are unable to determine why your PPO instance is slow please contact our Support Desk and they will be glad to assist.  In order to pinpoint the problem, they may ask you a number of questions such as:

  • What is your performance like when browsing other sites, e.g. www.cnn.com or www.fin24.com?
  • Has PPO suddenly become slow or has it been getting progressively slower over time?
  • Are there specific pages that are slow or is it all pages.  If it is specific pages that are slow, which pages? How long exactly does the page take to load?
  • The support team may also ask you to provide screenshots from the ping and tracert tests described earlier.

The more information you provide, the easier it will be for the technical team to assist you.

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