Looks like what my problem disappeared after some of the latest commits (glsl related?). Two days ago i disabled HyperZ via env vars and lockups in minecraft gone. But today i updated from git and enabled HyperZ to see if that happens again, but everything is good. If it necessary i can try to figure out what commit fixed this. Still have some quite rare hangups in some cases but it's not critical as they quickly gone. Strange. Thank you anyway.