i have problems with the lag, when i playing minecraft

i have LAG

do you know how to reduce the lag on my minecraft, the specs of my pc are:

HP notebook 440 g3
12GB ram ddr3
Core i3 6000u
1Tb HDD

my internet connection it's normal 10mb, when i'm downloading something the speed was up to 2mb per second, and i think than that is normal and good

can you help me with my problem?

i'm playing without mods, only optifine, and use the stock minecraft resource pack, i don't use shaders.