As time goes by your user base growing or simply daily usage can produce lots of issues and content inside Redmine. Depending upon your server choice and configuration, you might notice decreased performance. However, this does not necessarily need to be the cause of Redmine's slowdown. Generally, something else might be using your server, or causing the database, memory, or CPU to perform poorly.
The best way to monitor your server's capacity usage is to do it when it's maximally loaded. This is probably during work days. If you run webalizer statistics or something similar, you will get an hourly average usage log, like the following:
Obviously, the proper time to analyze CPU usage, database, and so on is between 2 and 9 hours.
Tip
Please keep in mind that your server may be in a different time zone and adjust the time difference between your time zone and the time zone displayed on the server's logs.
To actively monitor log (on Unix...