I've been having a few problems with Minecraft lately, and I'm seeking some help. On my laptop I get about 15-25 FPS when I look in a direction with few entities, but around 5-10 FPS when there are loads of them. Here are some specs: Windows 10 Home (64-bit) Processor: Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz RAM: 4.00 GB (3.88 GB usable) Installed: Optifine and 2 other mods I've tried using some custom JVM arguments but it doesn't really help, VBO's on or off (although one good thing with them, the "Loading Terrain" screen flashes by really quickly :D) Video settings are also minimal, but they don't seem to help Recently I'm unable to connect to servers on my computer. It gives a java.lang.NullPointerException: group error. Specs: Model: IdeaCentre-B320 Windows 10 Home (64-bit) - Java says it's 8(.1?) Processor: Intel(R) Core(TM) i3-2100 CPU @ 3.10GHz RAM: 8.00 GB **Since the Pixel Format Not Accelerated error occurs due to the outdated driver which doesn't support Windows 10, I'm using Java 8u25 as a workaround. Servers had worked perfectly fine with this setting up till recently. A sample of the Game Output log: Spoiler: Game Output (Skaijie) [20:12:16] [Client thread/INFO]: Connecting to astensity.com, 8121 [20:12:16] [Server Connector #1/ERROR]: Couldn't connect to server java.lang.nullPointerException: group at io.netty.bootstrap.AbstractBootstrap.group(AbstractBootstrap.java:80) ~[AbstractBootstrap.class:4.0.23.Final] at net.minecraft.network.NetworkManager.func_181124_a(NetworkManager.java:330) ~[eo.class:?] at net.minecraft.client.multiplayer.GuiConnecting$1.run(GuiConnecting.java:68) [bfa$1.class:?] I may have typed part of it wrong because the problem is on the computer and I'm creating this thread on my laptop XD Full log here Hamachi is installed on the computer. I've tried turning it off but it doesn't work. Error also occurs on vanilla Minecraft and other versions (e.g. 1.8.9) So, how do I fix it?