Do you experience massive lag spikes when playing minecraft? That's okay, Minecraft is a naturally laggy game. You would have to have a crazy-powerful computer for Minecraft to run without any lag. But there are very simple ways to help reduce lag!
Alright, so this way applies to both creative and survival mode:
Turn down your video settings. Firstly, TURN DOWN THE RENDER DISTANCE!!!! Turning down the render distance greatly reduces the lag, because the lower the render distance, the less chunks are loaded, which means that the game doesn't have to process a ton of stuff at once. Then, turn the max framerate to about 20-50. Don't do 10, unless you have a really bad computer, because the game will look very choppy and hard to play. Also turn the particles to 'minimal', and the biome blend to 0. Turning off clouds will help also. If you are still having problems, turn off fancy graphics. If you have a really bad computer, turn off the dynamic lighting. This is all the video settings I can think of right now, will probably add more later.
This should only really apply to creative mode, but if you are doing some cheaty survival world then I guess it'll work too. So, if you don't want mobs or entities ingame, first type in the chat, /gamerule DoMobSpawning false. This will prevent anything from spawning (as the command implies). Then, make sure you have a bed nearby, or if you are in creative, type /setworldspawn or /gamerule KeepInventory true (i have vitually no knowledge of commands so if anyone knows how to kill all entities without killing the player, please tell me in the comments). Then type, /kill @e. This will kill every mob and entity (i. e. mob drops, items, armor stands, minecarts, etc.) in the game. Then, do it a second time if you want to kill the mob drops from the killed mobs. This should help reduce lag because most entities have A.I., so the less entities there are, the less the game has to process.
If you are on a server, load a lot of chunks first before you let anyone play on it (i believe aternos automatically loads the spawn chunks), because a lot of people loading new areas will cause a ton of lag. So go into spectator mode or creative mode (or survival if you want to, it doenst really matter), and go around the world (maybe a couple hundred blocks away from spawn), which will load a lot of chunks, reducing the lag that players cause in-game.
This one might not apply to some players, but if you use a lot of redstone, use something other than redstone lines. Redstone lines are laggy, and you are better off using powered rails with an observer at the end (I have very little experience with redstone, so please correct me if I'm wrong).
Then finally, light up the caves under you if you are in survival and the difficulty is set to something other than peaceful. This prevents most mobs from spawning (prevents: zombies, skeletons, spiders, other common mobs. DOES NOT PREVENT: slimes (pretty much it, even though slimes are rare)). Also, as an added benefit, you can make a more efficient mob farm with this (although make sure to have an on/off switch, farms can be laggy).
TL;DR: lower video settings, kill all entities, load chunks, use powered rails, and light up caves to lower lag in minecraft
Special thanks to SuperRMo7 for suggesting numbers 4 and 5
Okay so those were 5 ideas that I could come up with, sorry if I have kind of bad grammar, I'm kind of mentally burned out (from other things) right now
Tell me if you know any other ways to lower lag
thanks for reading goodbye
