Coarse Grained Reconfigurable Architectures (CGRAs) have played a key role in the area of domain specific processors due to their programmability and runtime reconfigurability. The Coarse Grained Array (CGA) structure enables target designs to achieve high performance, but it is easy to fall into over-design in term of area. Moreover, the network overhead between the function units (FUs) seriously degrades its clock speed. In this paper, we propose a high performance CGRA that facilitates design space exploration (DSE) to reduce these overheads. It employs a concept of building blocks, named mini cores, to mitigate overhead involved in DSE that aims to achieve high clock speed and small area in the target design. The proposed approach reduces the design time more than 100 times compared with previous design. Experimental results show that the implemented architecture reduces logic area by 14.38% and improves clock frequency by 59.34% without performance loss.