You have still your Maschine project if you want change something in the beat. Make sure your beat is quite ready then export the tracks as wav and import them in Cubase.
There are several categories of solutions, as you can see in many posts on-line.
You can monitor CPU usage in Windows by clicking CRTL-SHIFT-ESC and then selecting CPU. So’ in this example, our song’s name is eMasterSound Metal, which when we select export for the bass track, we’ll see the file named eMasterSound Metal -Bass 03. Know that, Cubase will append whatever name you use here to the track name. If your export of a 3-minute song takes 3 minutes, you can imagine that it’s hard for Cubase to do in real time. Name the tracks, typically the song name, which you’ll add in the field Name. Real-time playback can be an issue because your mix, plugins, midi, etc. Using Cubase for a large project, I was sometimes annoyed by dropouts in audio during mixing/playback, and by the maddening “Audio drop out detected” message during recording.