It would be helpful to know a bit about your setup: CPU, RAM, HDD/SSD, and database size. I experienced the symptoms that you describe on a system with a 2nd gen. Core i5 CPU, 4 GB RAM, SATA III HDD, and 3 GB database; since having it replaced with a 6th gen. Core i5 CPU, 8 GB RAM, and SATA III HDD, I experience only occasional, minor lags.
I have no issues on another system with a 4th gen. Core i5 CPU, 8 GB RAM, and SATA III SSD.