I'm playing Minecraft on the go, which means leaving my beefy desktop and migrating to a weak Celeron N3050 laptop that I normally only use for programming or other forms of text editing. I know, it's a horrible machine to try and play games on, but I've gotten it to play Minecraft at >25 fps. But only one time (which I documented with a screenshot, here: https://i.imgur.com/63R0ttX.png ).
My problem is that most of the time, the game only sees the computer as having a single processor core. I know this because the debug menu (F3) shows "CPU: 1x Intel(R) blah blah". If it sees both CPU cores, it's a pretty enjoyable experience. But running on a single weak core makes the framerate drop to the low single digits, and I have no clue why it only recognized both cores one time.
I'm running Lubuntu 16.04, with either vanilla or OptiFine, with a 8x8 resource pack, and OpenJDK 11.
Unfortunately that computer is an antiquity and really doesn't meet Minecraft's system requirements.
Get back to your beefy computer or get a new computer!
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