Bisimilarity plays an important role in the analysis and verification of concurrent systems. In this paper, an optimization of the quasi-local algorithm of Du and Deng is proposed to make it applicable for general labeled transition systems. Both the optimized algorithm and the local algorithm of Fernandez and Mounier are implemented in Java, and experiment using the VLTS benchmark suite shows the former outperforms the latter in most cases. The algorithms are also modified to check similarity. Finally, a procedure for transforming labeled transition systems is implemented to facilitate checking weak bisimilarity.