You'll have to make some compromises if you don't want to increase it.
You can usually get around it by using an alternate instrument to record with and then exporting the finished file using the actual software. That way the cpu isn't tied up actually playing the file in real time.
Like with TheGrand. you can use another lo-fi piano to record with. Then export the sound using TheGrand. Or with heavy synth sounds ilike Absynth, you just use an alternate synth sound from something else to record the notes with, then export it and listen to the results.
It slows you down, but there's an actual advantage in that you're forced to spend more time on the individual parts. Sometimes computer recording speeds things up so much that you don't stop to get a fresh perspective on what you're recording.
The end result though, is eventually you're gonna have to get more ram and the fastest CPU you can get. The new stuff coming out just won't work on slower computers.