We develop a cache efficient Louvain community detection algorithm. Its effectiveness is demonstrated by benchmarking it against four existing Louvain algorithms on the Intel Knights Landing (KNL) and Haswell computational platforms using real and synthetic datasets. For a single iteration of Louvain, our algorithm obtains a speedup of up to 76.18% on real datasets on KNL, 51.91% on real networks on Haswell, 71.31% on synthetic networks on KNL, and 59.13% on synthetic networks on Haswell. These percentages using 2 iterations are 62.91%, 43.27%, 67.61%, and 54.43%, respectively.