How to get better performance from Minecraft on a i7-8750H and RTX 2070 [duplicate]
Solution 1:
There are a number of mods that claim to improve FPS in Minecraft. My experience is limited to OptiFine (an updated version of Optimine from around version 1.2) on 1.8.1, but I do see a very significant improvement in my FPS. Although it's a bit non-specific, I have seen my FPS on a Mac go from completely unplayable to very smooth.
OptiFine (Minecraft Forum Link) reworks a number of rendering details to improve Minecraft performance (+20fps). Many people go crazy about it on the forum, others say that it just doesn't work so YMMV.
Last I heard, Notch was actually including some of these optimizations into Minecraft proper.
Keep in mind that any Minecraft mod that's not a skin requires you to patch the Minecraft code itself and thusly may not be compatible with other mods or your Minecraft version.
Solution 2:
Within the options menu (Esc -> Options), set Graphics to Fast and set Render Distance to Tiny.
Close any programs you can spare to lose (ie internet browser, messenger, music).
If you're really desperate, you can open your task manager (Ctrl + Alt + Delete -> Start Task Manager) and select the "Processes" tab. Order by "Memory" and have a look at what's taking up so much processing power on your computer (Minecraft will be listed as javaw.exe). Use the End Process button to stop a selected process.
Do not end any processes that you don't know what they are. Have a look at the "Description" tab, and if you know what the process does, and you know you don't need it, then end it.