If you notice that opening a record takes longer than 10 seconds, press F5 (or the back arrow on your browser) and then start again.
*Note: the system is based in "cached data". This means that opening a form for the first time will take longer than subsequent times.
Cache - cache is used to shorten data access times, reduce latency and improve input/output. For example, if you visit a website's home page, the files that your browser requests are stored on your computing device's disk drive in the browser's cache. If you click "back" and return to that home page, your browser can retrieve most of the files it needs from cache instead of requesting they all be sent again. This is called read cache and as your browser saves time getting the files it needs, the website's home page will load faster.
The above explanation applies to how your platform behaves. However, sometimes the page stored in the cache is "old" and needs reloading. This is because the developer might have make changes to some of the forms.
Follow this link about clearing old pages on your cache.