CRM team will be doing a soft mass deletion of accounts, can this increase the system performance

We are having ~970K party IDs in OSC and we are planning to deactivate ~100K to 120K

We will be soft deleting these records, so that they will not be available/visible for users during quoting and opportunity creation activities

We need know the impact of this on the performance of OSC. If it improves the performance, by how much percent can we expect is the a