Bug Ticking memory connection problem

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Reduce allocated ram, 12gb is way too much.

For 1.7.10 and older 2-4gb is enough
for 1.10 and later 4-6gb should do it.

Also remove optifine, then try again.

If it still fails, post full log using paste.feed-the-beast.com and share the link.
Instructions can be found here:
https://support.ftb.world/