LAGGING SO HARD

so quite a while ago i have been having problems with minecraft since i changed my windows version from win7 to 10 and with the new launcher update the my game completely changed at first the launcher begins lagging and i can't even click on start i tried to reinstall the game but still the same so i let it like that for a while. a week after that i opened the game and the launcher came back to normal i thought it fixed itself but when i started the game it begins lagging so hard i couldn't even play or click on play so i began thinking that the problem came from java so i reinstall it but the same i tried older version but nothing fixes it. when i tried java 32 bit it worked without lag at first i play for an hour and it crash then 30-45 min then 5 min and it crash i can't play on server or single player it's too sad

help me please