cpu overload cubase 10 pro

hi , i got a problem with cpu … im using cubase 10 pro with several native istruments vsts … i can only record few instrument tracks and about 8 audio vocals and the whole system starts to go crazy … cuts out lots of audio , and adding any additional tracks is impossible … i am using i5 2.3 ghz processor , 16 gigs of ram , lots of memory … i cant belive its stuck so early in the project .I mus say that i am not using any effects , eq or inserts … its just the beginning and its stuck !!! … i have checked out the forum briefly and it seems nobody has an answer ? … i am frustrated and it seems i am not the only one … i maxed out the processing to 2048 mb , it helped for about 3 tracks … please help me !!!