In the section for the Java Executable, click on 'Browse'. Now click on 'More Options' in the bottom left of the menu that comes up. Once you've located it, click on the menu button to the right and select 'Edit'. Look for the profile with the name 'OptiFine'. Here, you'll find all of your launcher profiles. Navigate to the 'Installations' tab at the top. Don't worry, it's simple.įirst, open the Minecraft launcher. You'll want the JRE installer, and just to be sure everyone gets this. This should be simple, but just in case, here's a little tool to tell you.įinally, you'll be asked to select a download. In summary, your best bet would be to try both and see which one works best on your system. However, its incredibly low memory usage and better garbage collector may result in a net positive for usage in Minecraft. Bunch of technical stuff behind this spoiler: I've been told OpenJ9 is better optimized than HotSpot, but I've also been told it's 10-20% slower in terms of raw CPU performance. Head to and select the version of Java you'd like (I suggest OpenJDK 11). This is 'hard' part: Getting AdoptOpenJDK.

From this point forward, we will assume you already have OptiFine installed and working. There's like a million tutorials out there to install OptiFine, so I won't include it here. Sorry, I don't know how MultiMC works.įirst, you need the latest OptiFine F1 pre15 (or whatever's newer, I guess). Lastly, this will only cover the new vanilla launcher. In my case, I gained a MUCH more stable framerate and incredibly reduced RAM usage. Results will vary a lot, depending on your hardware. One thing to note, this may or may not actually provide a noticeable improvement to the games performance. This tutorial will cover how to download the right version of AdoptOpenJDK, and how to tell Minecraft to use it when launching the game. I posted about this on Twitter a bit ago and many people are asking how to make this absolute magic work. The latest OptiFine 1.14.2 preview added compatibility for newer Java versions 9 and up. EDIT 3: This should work for ALL versions of OptiFine 1.14.2 pre15 and newer. EDIT 2: Most people seem to agree that OpenJ9 works fine with Bukkit/Spigot so I just decided to remove the warning. You don't need to do all of this just to get OptiFine 1.14.2 running, although I'd still recommend this for all the major benefits you gain from it. EDIT: Just to be clear, this is ENTIRELY optional.

Jdk for optifine