VM with multiple vCPU on an ESXi

Hi everyone,

Please consider the following examples:

Example#1

Single ESXi with 8 logical CPU , ESXi host is hosting single VM, this VM has  a single vCPU.

Currently VM's  vCPU is running at 98% utilization, VM is dedicated to run single-threaded application.

1) Assigning more vCPU to VM will not make any difference as VM is dedicated to  run single  threaded application  right ?

If that is true, what else we can do to alleviate  vCPU's utilization in above case?

Example#2

Single ESXi with 8 logical CPU , ESXi hosts single VM, this VM has single vCPU.

Currently VM vCPU is running at 98% utilization, VM is dedicated to run multi- threaded applications.

1) Assigning more vCPU to VM will help alleviate the vCPU's utilization as application is multi-threaded therefore take advantage of vCPUs available and we are not over provisioning   Logical CPU on ESXi host right?

Thanks and have a good weekend!!