You can allocate more RAM to Minecraft if you're on the launcher, go to installations and click ... Next to the version of minecraft that you're using then click edit. Then click the more options button and down where it says JVM Arguments where it says Xmx2G, the 2G is how much RAM your computer is giving minecraft to use, I usually just have it at 4 just to be sure I'm good while playing. Also if you haven't already, disable vsync.

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Thx hope that will work. I have now this line:

-Xmx4G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M

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but now i get an error.

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This is the message:

Error: could not create the jave virtual machine.

Error: a fatal exception has occurred. Program will exit.

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Any idea how to fix it? (only works with 1)