Corona interactive very slow but normal render very fast

Corona interactive very slow

I just assembled a new PC, and corona is working fast for the normal 2k and 4k renders. However, my interactive render speed is much much lower and I am unable understand the problem. How can interactive be much slower than final render

Following are my specs

Ryzen - 9 - 7950X - 16 Core
Ram - 32gb

Have not installed any graphics card yet as corona uses CPU entirely but I will be installing an additional graphics card next month.