I bought a new PC with 32gigs of ram and an i7 and a "decent" gpu. Me and my friends have a realms server and blablabla. Anyway, my game lags every 2 seconds for 1 millasecond. It's not really a problem, more of a nuisance. I've gotten Optifine and I've played with all of my settings and I get around (Without Optifine) 130-150 and with Optifine I get around 200, so my pc can easily handle it.
Read more: Bought a new pc and Minecraft gets lag every 2 seconds
