Hello, I made a minecraft forums acount for this issue I've been having.
I have a gaming laptop (Lenovo Legion Y520)
Intel Core i5-7300HQ
2.50 GHz CPU
8GB RAM ( 3GB dedicated GPU RAM)
Nvidia GeForce GTX 1060
The store I ordered it from has the calculated FPS you'd get on average on highest graphic settings, and I should realistically get around 300 FPS on lower settings.
However, I only get 20-40 FPS while playing. I managed to reach 60 FPS by the use of OptiFine and BetterFPS + tweaking all the settings to the lowest.
The Windows 10 edition of Minecraft runs way smoother, but I want to be able to play with some minor mods.
Unrelated to the main issue at hand, I think this is connected to the FPS problem somehow.
If I try to run the game with mods installed that change what structures get added, mobs spawn, or biomes in general, I can't even create a world. I can create a world, join in for 2 seconds before it tells me a fatal error occurred and shuts down. Then it sends me to the Server list.
I don't get this problem with using TechnicLauncher however, but I experience different issues like not the entire modpack loading in.