to allow more memory to Cubase

I have a 16GB computer, and a Cubase proyect with 300 tracks, when I put the auto tune plugin on some tracks, then, suddenly the auto tune says that “out of memory, insuficient memory”.

I put “relaxed” the latency of the audio interface, but where can I put more memory to the Cubase program itself? I can mix because the program and the autotune don’t run.