Fix overuse of shared resources on server

We are a small NGO and have a very basic website - that will be renewed soon - but for now we need to keep displaying for a few more months. We do NOT use the most recent version of Drupal. We have received a error message from our hosting company. Please find the error message below. Some details are not included but you get the general work that needs to be done. It is hard to konw where the problem lies without diving into the project. According to our hosting company our website: "continuously consumes a higher than the reasonable percentage of the shared resources of the server it is hosted on. As a result, we had to temporarily put an upper limit to the shared server resources your account can use in order to maintain the stability of the server. Please note that in case you exceed the current limit, it may result in occasional "Resource temporary unavailable" error messages shown on your website. Also, if this issue is not addressed within the next 7 days, we will be forced to take further action which will result in website downtime - we will do our best to avoid this, but we need your cooperation. Since we believe you are not causing the high server load intentionally, we will do our best to assist you so that your site can be fully functional again as soon as possible. Below you will find some explanations on what might have caused the high resources consumption and several solutions on how to deal with it. We recommend that you review all enclosed information in order to get a better hold of the problem and help us resolve it as fast as possible without any further inconvenience to you. Sincerely, [login to view URL] As you know, your account is hosted on a shared hosting server and thus is sharing its resources with other customers' accounts on the same server. The issue with shared servers is that regardless of how powerful or well optimized they are, as is the case with our machines, there's still the possibility that a single user, or even a single application takes up most of its resources and overloads the machine. This causes all accounts on the server to stop responding and become inaccessible. In order to prevent server overload, as soon as we detect a source of high load, it has to be isolated so that it cannot affect the overall server performance. This is a common scenario with shared hosting servers. Unfortunately, most hosting providers fail to detect such sources in time or when they do it's already too late, so the most common course of action is to simply suspend the account in question without any notification to the client, with no detailed report for the suspension and without giving the site owner the option to fix the problem. We, however, believe in early warning and allowing the client enough time to react and work towards resolving the issue. While trying to minimize the inconvenience for you as far as we can, we do have an obligation to keep the shared hosting service as stable and as fast as possible for the rest of the clients hosted on your server. That is why we were forced to temporarily limit your account in order to avoid thoroughly suspending it when the load becomes unmanageable. We have conducted a detailed investigation and it turned out that your Drupal executes slow queries towards its database, which eventually hogs the server. The server tries to execute your slow queries while putting other processes in the queue until some memory is freed. While they are waiting however, they stack up and cause further problems. There can be many reasons for slow database queries, but the following 3 are the most common ones: 1. Large database 2. Not well written scripts 3. Large number of internal links that query the database directly. END OF MESSAGE