This is spammed in my chat after a little while of building and a lot of entities go invisible like the mixer fan ect

Sorry, were you meaning to include something like the output and a log? :/

I can verify this, and the client log spam does cause major lag spikes. Here is the only info OpenGL gives though, which is why I was reluctant to open this myself:

##########
[01Apr2020 06:06:50.779] [Client thread/ERROR] [net.minecraft.client.MainWindow/]: @ Pre render
[01Apr2020 06:06:50.779] [Client thread/ERROR] [net.minecraft.client.MainWindow/]: 65539: Invalid key -1
[01Apr2020 06:06:50.827] [Client thread/ERROR] [net.minecraft.client.MainWindow/]: ########## GL ERROR 

I've had this error before on a mod I developed, but I can't remember what the problem/fix is. It was mild in the previous version, but got worse for 0.2.2a. The actual log file was about 100mb after a few hours of play, almost entirely that specific line.

Took me awhile to figure out which mod it was because it's part of a rather large modded server for streamers.

Thank you guys, I've found that in survival so far it is fine but the problem arose in creative when using many mechanical parts (I was trying to make an auto wheat farm with a windmill)

You can also disable them in the settings when using optifine. It does not fix the errors but stops them from clogging up your chat.

I'm not using Optifine, the reported error is from Minecraft itself.

Yes. But as I said:

You can also disable them when using optifine.

So although it does not fix them, installing optifine gives you away to stop them from spamming your chat. That’s all.

Yeah, there are other problems with Optifine in 1.14, especially with JEI. Optifine spams the chat and log, while without Optifine it only spams the log.

The problem is the log spam, because that requires disk writing. I'm still placing Create at the front and center of my modded server because I absolutely love the mod, it would just be nice to get this taken care of in the next update. ;)

Okay, I'm going to go ahead and say that this might not be Create at all. This issue may be because of another mod.

I cannot reproduce it in singleplayer for the life of me, no matter what I try. But in multiplayer with Forge it seems to happen with nearly any combination of mods.

It has also been reported on many mods and it seems to do with InputMappings.isKeyDown more often than not. I don't think Create has any keybindings to cause this, however I have a few mods that do.

So for on my end, I can't say conclusively that Create is connected to this in any way.

I have this exact problem with create only when "fancy windows" are placed in the world. Doesn't even matter if they are out of render distance. It would be one thing if it was only messages. But it also causes lag.

There have been significant rendering changes due to 0.3.1's Flywheel renderer. If this issue persists, please make a new issue report for the latest version :D