The next configuration tab is of great importance as these options will provide you with more control over the URLs.
Using the URL cache means that the SEF URLs created by sh404SEF will be stored in a separate cache on your server. This is meant to decrease the loading time of your site, as it eliminates the need for sh404SEF to query your database for the right URL to a page, it will use the one from the cache.
Using the standard cache size of 10000 Kb means you are using approximately 1 MB of your server space. This means there can be around 5000 URLs in that space. If you have more than that, increase the size of the cache if you need to, count 1MB extra for every 5000 URLs. You can check the number of URLs created by sh404SEF on the control panel and if you want to know how many articles you have, check the last page of Article Manager and look at the last article number, that would give you some idea. Be aware that the installed components...