Hi,
The list of reasons why you could be having issues is not a short one but two important questions are
1: Was it always like this?
2: Have you changed anything since it worked fine?
If the machine ran well when it was younger and your demands have not increased then most likely it's time for a cleanup or reinstall of your OS, personally I would verify health of Ram and hard drives too.
If it was always a bit underpowered then the important thing is to find out specifically what area it's struggling in.
Windows has system monitors you can use to determine if CPU is maxed out, or if you're running out of ram or if (unlikely in your case) it's struggling to read/write to hard drive fast enough.
Knowing which of these things is limiting you is key to fixing it, if possible.
Compatibility is also a consideration.
Make sure your version of cubase is listed as compatible with your current operating system, and ensure that the versions of any plugins you are using are compatible with both your cubase and OS version.
Realistically, though, this is a 2013 PC if wiki is telling me the truth.
If it's nice and clean, hardware is healthy, and all version are compatible, it might just be upgrade time.
Tell us more.
